LANGSDORF A S, . (1985). THEORY OF ALTERNATING CURRENT MACHINERY. : TATA MC GRAW HILL.
LANGSDORF A S, . 1985. THEORY OF ALTERNATING CURRENT MACHINERY. : TATA MC GRAW HILL.
LANGSDORF A S, . THEORY OF ALTERNATING CURRENT MACHINERY. : TATA MC GRAW HILL. 1985.