621.31 Lev E Levi, Enrico, 1918- Electromechanical power conversion; lowfrequency, low-velocity conversion processes [by] Enrico Levi and Marvin Panzer . New York, McGraw-Hill [c1966] xxvii, 499 p . diagrs., gráficos, tablas . 24 cm . (Brooklyn Polytechnic Institute series . McGraw-Hill electrical and electronic engineering series) Incluye bibliografía