V. Bezrukov, V. Pugachov, P. Shipkovs, G. Kashkarova and Vl. Bezrukov, “Investigation of the Wind Energy Potential in the Baltic Region,” SCW2005, ISES Solar World Congress, Orlando, US, August 6-12, p. 6.
 R. G. Deshmukh and R. Ramakumar, “Reliability Analysis of Combined Wind-Electric and Conventional Generation Systems,” Solar Energy, Vol. 28, No. 4, 1982, pp. 345-352. doi:10.1016/0038-092X(82)90309-7
 R. Nagarkar, “Availability of Wind-Electric Conversion Systems,” Poster Presentation, IEEE PES General Meeting, Tampa, Florida, 2007.
 K. Khouzam and K. hoffman, “Technical Guidelines for the Interconnection of PV Generation Systems in Queensland,” IEEE 26th PVSC.
 J. J. Bzura, “Performance of Grid Connected Photovoltaic Systems on Residences and Commercial Buildings in New England,” IEEE Transactions on Energy Conversion, Vol. 7, No.1, March 1992.