@book{15112,
	author = {Beltr n Virgilio},
	title = {PRINCIPIOS DE FISICA, CURSO DE INTRODUCCION/ },
	publisher = {EDITORIAL TRILLAS},
	year = {1972},
	address = {MEXICO: },
	note = {1.-Cinem tica, 2.-Din amica, 3.-Ondas, 4.-Electromagnetismo 5.-Optica}
}