Circulation centrifugal pump with variable speed drives and minimal electricity consumptionVodovozov, Valery; Gevorkov, Levon; Raud, Zoja2017 11th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG 2017) : Cadiz, Spain, 4-6 April 20172017 / p. 334-339 : ill http://dx.doi.org/10.1109/CPE.2017.7915193