Q. H. De Tran, P. Bertini, C. Zaouter, L. Muñoz and R. J. Finlayson, “A Prospective, Randomized Comparison between Single- and Double-Injection Ultrasound-Guided Infraclavicular Brachial Plexus Block,” Regional Anesthesia & Pain Medicine, Vol. 35, No. 1, 2010, pp. 16-21.
 P. Marhofer, M. Greher and S. Kapral, “Ultrasound guidance in regional anaesthesia,” British Journal of Anaesthesia, Vol. 94, No. 1, 2005, pp. 7-17.
 V. Piacherski, A. Marochkov, A. Brukhnou and Z. Kokhan, “Comparison of Three Methods of Regional Anesthesia of Peripheral Nerves and Plexuses,” Open Journal of Anesthesiology, Vol. 2, No. 5, 2012, pp. 237-243.
 M. K. Son, R. K. Chung, Y. J. Kim, D. Y. Kim, H. S. Lee and J. I. Han, “The Effects of Local Anesthetic Distribution on Symptoms Using Ultrasound Image after Stellate Ganglion Block,” Korean Journal of Anesthesiology, Vol. 57, No. 5, 2009, pp. 579-583.
 P. Marhofer, W. Harrop-Griffiths, S. C. Kettner and L. Kirchmair, “Fifteen Years of Ultrasound Guidance in Regional Anaesthesia: Part 1,” British Journal of Anaesthesia, Vol. 104, No. 5, 2010, pp. 538-546.
 D. Latzke, P. Marhofer, M. Zeitlinger, A. Machata, F. Neumann, E. Lackner, et al., “Minimal local anaesthetic volumes for sciatic nerve block: evaluation of ED99 in volunteers,” British Journal of Anaesthesia, Vol. 104, No., 2010, pp. 239-244.
 V. Piacherski and A. Marochkov, “A Comparison of the Onset Time of Complete Blockade of the Sciatic Nerve in the Application of Ropivacaine and Its Equal Volumes Mixture with Li-Docaine: A Double-Blind Randomized Study,” Korean Journal of Anesthesiology, Vol. 65, No. 1, 2013, pp. 42-47.
 G.-J. van Geffen, “The Value of Ultrasonography for Performing Peripheral Nerve Blocks. Theory, Practice and Clinical Experience in Adults and Children,” Optima Grafische Communicatie, Rotterdam, 2008. pp. 234-279.
 H. L. Andersen, S. L. Andersen and J. Tranum-Jensen, “Injection inside the Paraneural Sheath of the Sciatic Nerve: Direct Comparison among Ultrasound Imaging, Macroscopic Anatomy, and Histologic Analysis,” Regional Anesthesia and Pain Medicine, Vol. 37, No. 4, 2012, pp. 410-414.