Power losses and efficiency of class E RF power amplifiers at any duty cycle. - Donald J. Kessler; Marian K. Kazimierczuk (ISCAS (3), 2001)

Power losses and efficiency of class-E power amplifier at any duty ratio. - Donald J. Kessler; Marian K. Kazimierczuk (IEEE Trans. Circuits Syst. I Regul. Pap., 2004)