The 3 references without contexts in paper V. Karpuhin A., V. Zamiatina A., В. Замятина А., В. Карпухин А. (2016) “Теоретическое изучение применения амплитудной модуляции при радиочастотной электрокоагуляции // Theoretical Study of Amplitude Modulation Application during Radio Frequency Electrocoagulation” / spz:neicon:technomag:y:2015:i:5:p:178-189

Friedrichs D.A., Erickson R.W., Gilbert J. A New Dual Current-Mode Controller Improves Power Regulation in Electrosurgical Generators // IEEE Transactions on Biomedical Circuits and Systems. 2012. Vol. 6, iss. 1. P. 39-44. DOI: 10.1109/TBCAS.2011.2159859
(check this in PDF content)
Friedrichs D.A., Erickson R.W., Gilbert J. A new system architecture improves output power regulation in electrosurgical generators // 2011 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC. IEEE Publ., 2011. P. 68706873. DOI: 10.1109/IEMBS.2011.6091694
(check this in PDF content)
Bialasiewicz J.T., Bowers W.J. Performance study of current-controlled versus voltagecontrolled radio frequency power generator at low sampling frequency // 2010 IEEE International Symposium on Industrial Electronics (ISIE). IEEE Publ., 2010. P. 3298-3303. DOI: 10.1109/ISIE.2010.5637572
(check this in PDF content)