The link "https://www.apidologie.org/articles/apido/pdf/1999/03/
Apidologie_0044-8435_1999_30_4_ART0004.pdf" did not give any Oxalic info
but at the same site
https://www.apidologie.org/component/solr/?task=results#!q=oxalic&sort=relevance&rows=10
This gave links to a few articles of interest.

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