M. Heschel

Preparation of Carboxylic Acid Derivatives of Oxalic Acid-N1-acyl Amidrazones.

J. Stein, J. Dost, M. Heschel, 1987 .

Citric acid as a pH-modifying additive in an extended release pellet formulation containing a weakly basic drug

C. Leopold, J. Andersch, J. Pløen, 2009, Drug development and industrial pharmacy.