por Dorf, Richard C [autor] | Svoboda, James A [autor] | Renau Ballester, Ruy [traductor] | Gonzalez Pozo, Virgilio [traductor].
por Stremler, Ferrel G [autor] | Renau Ballester, Ruy [traductor] | Fajury Añez, Emilio [traductor] | Stremler, Ferrel G. Introduction to communication systems.