LEVELS OF THIAMINE AND ITS ESTERS IN BEE COLLECTED POLLEN USING LIQUID CHROMATOGRAPHY AND ROBOTICS E.W. HERBERT Jr., J.T. VANDERSLICE, MEIS-HSIA HUANG and D.J. HIGGS Apidologie, 18 2 (1987) 129-136 DOI: 10.1051/apido:19870203