@incollection{:/content/books/9789210454957s002-c037, author = "United Nations", title = "No. 33587. Spain and Paraguay", booktitle = "Treaty Series 1965", publisher = "United Nations", year = "2001", pages = "75-99", url = "https://www.un-ilibrary.org/content/books/9789210454957s002-c037" }