TY - RPRT TI - Improved method for simultaneous determination of ascorbic acid and dehydroascorbic acid, isoascorbic acid and dehydroisoascorbic acid in food and biological samples. AU - M A Kall AU - C Andersen PY - 1999 DO - 10.1016/s0378-4347(99)00193-0 UR - https://pubmed.ncbi.nlm.nih.gov/10437677/ ID - 10437677 ER -