@book{6415252,
	title = {Электронные реле времени ВЛ-15, ВЛ-16, ВЛ-17, ВЛ-18, ВЛ-19, ВЛ-21},
	publisher = {Б. и.},
	year = {[1973]},
	series = {Информэлектро},
	address = {Москва}
}