Dinnes, D.L. (2004) Assessments of Practices to Reduce Nitrogen and Phosphorus Nonpoint Source Pollution of Iowa’s Surface Waters. Iowa Department of Natural Resources in Cooperation with the USDA-ARS National Soil Tilth Laboratory Iowa, USA, 380p.
 Suliman, A.S. and Post, D.F. (1988) Relationship between Soil Spectral Properties and Sand, Silt, and Clay Content of the Soils on the University of Arizona Maricopa Agricultural Centre. Proceedings of Hydrology and Water Resources in Arizona and the Southwest, 16 April 1988, Tucson, Arizona (Arizona-Nevada Academy of Science, Tucson Arizona), 18, 61-65.
 Coleman, T.L., Agbu, P.A., Montgomery, O.L., Gao, T. and Prasad, S. (1991) Spectral Band Selection for Quantifying Selected Properties in Highly Weathered Soils. Soil Science, 151, 355-361.
 Stenberg, B., Raphael, A., Rossel, V., Mouazen, A. and Wetterlind, J. (2010) Visible and Near Infrared Spectroscopy in Soil Science. In: Sparks, D.L., Ed., Advances in Agronomy, Academic Press, Burlington, 163-215.
 Barnes, E.M., Sudduth, K.A., Hummel, J.W., Lesch, S.M., Corwinm, D.L., Yang, C., Daughtry, C.S.T. and Bausch, W.C. (2003) Remote- and Ground-Based Sensor Techniques to Map Soil Properties. Photogrammetric Engineering & Remote Sensing, 69, 619-630.
 Piikki, K., Soderstrom, M. and Stenberg, B. (2011) Sensor Data Fusion for Topsoil Clay Mapping of an Agricultural Field. The Second Global Workshop on Proximal Soil Sensing, Montreal, 15-18 May 2011, 56-59.
 Aboukarima, A.M. and Saad, A.F. (2006) Assessment of Different Indices Depicting Soil Texture for Predicting Chisel Plow Draft Using Neural Networks. Alexandria Science Exchange Journal, 27, 170-180.
 Van Egmond, F.M., Loonstra, E.H and Limburg, J. (2008) Gamma-Ray Sensor for Topsoil Mapping: The Mole. Proceedings of the 1st Workshop in High-Resolution Digital Soil Sensing and Mapping, Sydney, 5-8 February 2008, Workshop Program and Papers, Volume II.
 Hosseinzadeh, B., Zareiforoush, H., Adabi, M.E. and Motevali, A. (2011) Development of a Fuzzy Model to Determine the Optimum Shear Strength of Wheat Stem. International Journal of Computer Science and Telecommunications, 2, 56-60.
 Mcbratney, A.B. and Odeh, I.O.A. (1997) Application of Fuzzy Sets in Soil Science: Fuzzy Logic, Fuzzy Measurements and Fuzzy Decisions. Geoderma, 77, 85-113.
 Bektas, S. and Ozgan, E. (2010) Adaptive Neuro Fuzzy Inference System for Estimating Particle Diameter of Soils in Micro Structure for Varying Quantities of Sodium Hexametaphosphate. Scientific Research and Essays, 5, 782-789.
 Hebinck, K., Middelkoop, H., Van Diepen, N., Van der Graaf, E.R. and De Meijer, R.J. (2007) Radiometric Fingerprinting of Fluvial Sediments in the Rhine-Meuse Delta, the Netherlands—A Feasibility Test. Netherlands Journal of Geosciences, 86, 229-240.
 Al-Hamed, S., Wahby, M., Al-Sulaiman, M., Al-Saqer, S. and Aboukarima, A. (2012) Application of Artificial Neural Networks to Predict Natural Soil Radionuclides Concentrations in Some Saudi Agricultural Soils. Archives Des Sciences, 65, 196-206.
 Kumar, P., Kumar, D., Jaipaul, A. and Tiwari, K. (2012) Evaporation Estimation Using Artificial Neural Networks and Adaptive Neuro-Fuzzy Inference System Techniques. Pakistan Journal of Meteorology, 8, 81-88.
 Takagi, T. and Sugeno, M. (1985) Fuzzy Identification of Systems and Its Applications to Modeling and Control. IEEE Transactions on Systems, Man and Cybernetics, 15, 116-132.
 Yan, H., Zou, Z. and Wang, H. (2010) Adaptive Neuro Fuzzy Inference System for Classification of Water Quality Status. Journal of Environmental Sciences, 22, 1891-1896.
 Gokceoglu, C. and Zorlu, K. (2004) A Fuzzy Model to Predict the Uniaxial Compressive Strength and the Modulus of Elasticity of a Problematic Rock. Engineering Applications of Artificial Intelligence, 17, 61-72.
 Saleh, I.H. (2012) Radioactivity of 238U, 232Th, 40K, and 137Cs and Assessment of Depleted Uranium in Soil of the Musandam Peninsula, Sultanate of Oman. Turkish Journal of Engineering and Environmental Sciences, 36, 236-248.
 Thabayneh, K.M. and Jazzar, M.M. (2012) Natural Radioactivity Levels and Estimation of Radiation Exposure in Environmental Soil Samples from Tulkarem Province-Palestine. Open Journal of Soil Science, 2, 7-16.
 Golmakani, S., Moghaddam, M.V. and Hosseini, T. (2008) Factors Affecting the Transfer of Radionuclides from the Environment to Plants. Radiation Protection Dosimetry, 130, 368-375.
 Blanco Rodriguez, P., Tome, F.V., Lozano, J.C. and Perez-Fernandez, M.A. (2008) Influence of Soil Texture on the Distribution and Availability of 238U, 230Th, and 226Ra in Soils. Journal of Environmental Radioactivity, 99, 1247-1254.
 Vukasinovic, I., Dordevic, A., Rajkovic, M.B., Todorovic, D. and Pavlovic, V.B. (2010) Distribution of Natural Radionuclides in Anthrosol-Type Soil. Turkish Journal of Agriculture and Forestry, 34, 539-546.
 Al-Sulaiti, H.A. (2011) Determination of Natural Radioactivity Levels in the State of Qatar Using High Resolution Gamma-Ray Spectrometry. PhD Thesis, Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey.
 Tchokossa, P., Makon, T.B. and Nemba, R.M. (2012) Assessment of Radioactivity Contents and Associated Risks in Some Soil Used for Agriculture and Building Materials in Cameroon. Journal of Environmental Protection, 3, 1571-1578.
 Pallavicini, N. (2011) Activity Concentration and Transfer Factors of Natural and Artificial Radionuclides in the Swedish Counties of Uppsala and J?mtland. MSc Thesis, Swedish University of Agricultural Sciences, Department of Soil and Environment, Uppsala, 61p.
 El-Arabi, A.M., Abbady, A.G.E. and Hussein, A.S. (2006) Gamma-Ray Measurements of Natural Radioactivity in Sedimentary Rocks from Egypt. Nuclear Science and Technique, 17, 123-128.
 Navas, A., Soto, J. and Machin, J. (2002) Edaphic and Physiographic Factors Affecting the Distribution of Natural Gamma-Emitting Radionuclides in the Soils of the Arnas Catchment in the Central Spanish Pyrenees. European Journal of Soil Science, 53, 629-638.