You may also wish to search for items by Hein, L. and Hein.
Only one matching reference was found.
Coon, F.B.; Richter, E.F.; Hein, L.W.; Krieger, C.H., Problems Encountered in Physicochemical Determination of Warfarin, J. Agric. Food Chem., 1954, 2, 739-741. [all data]