@book{2607,
	author = {World Health Organization},
	title = {Biological substances : international standards and reference reagents : 1990},
	publisher = {WHO,},
	year = {1991.},
	address = {Geneva : },
	url = {https://apps.who.int/iris/bitstream/handle/10665/37045/9241544295.pdf?sequence=1&isAllowed=y}
}