Enlace original:
https://wedocs.unep.org//handle/20.500.11822/30137
United Nations Environment Programme
,
[Eutrosym '76: Proceedings the International Symposium on Eutrophication and Rehabilitation of Surface Water - Vol. I, Part 1]
,
Eutrosym '76: Proceedings the International Symposium on Eutrophication and Rehabilitation of Surface Water - Vol. I, Part 1