Tropper, H. Electric circuit theory: an introduction to steady state and transient theory based on the superposition principle / H. Tropper - London: Longmans, Green and co., c1949. - xi, 164 p.: table, figs., ill.; 22 cm. Includes index English LCCN: 50014513 Subjects--Topical Terms: Electric circuits.Electric currents LC Class. No.: TK3001 / .T7 Dewey Class. No.: 621.31/TRE