@book{1051,
	author = {Hessing, Jacob,},
	title = {Logica als leer van zuivere rede ...},
	publisher = {C.A.J. van Dishoeck,},
	year = {1941-},
	address = {Bussum,},
	note = {Vol. 1 is based on a lecture course given in 1937-38. cf. v. 1, p. 1, foot-note.}
}