@book{37634,
	author = {Khvol'son, Orest Daniilovich and Aguilar-Amat, Juan B. de},
	title = {Tratado de física 11 : campo magnético constante},
	publisher = {Feliu y Susanna, },
	year = {1921.},
	address = {Barcelona : },
	note = {Segunda parte.}
}