@book{3749,
	author = {Perkins, F. T. (ed.) and International Association of Biological Standardization (ed.)},
	title = {International symposium on vaccination against communicable diseases(symposia series in immunobiological standardization) (vol-22)},
	publisher = {S. Karger},
	year = {1973},
	series = {22},
	address = {Basel}
}