SA Visser, Sci Total Environ. 1987 Apr;62:347-54. https://www.ncbi.nlm.nih.gov/pubmed/2953069
Exploring the emerging science of humic acid, fulvic acid, and related compounds beneficial to human health
SA Visser, Sci Total Environ. 1987 Apr;62:347-54. https://www.ncbi.nlm.nih.gov/pubmed/2953069