"Oxamic acid". PubChem. National Center for Biotechnology Information, U.S. National Library of Medicine. Archived from the original on 2016-12-01. Retrieved 2016-12-14.
"Oxamic acid". PubChem. National Center for Biotechnology Information, U.S. National Library of Medicine. Archived from the original on 2016-12-01. Retrieved 2016-12-14.