Studies on glyco proteins of animal origin and on their derivatives part 2 synthesis of the poly sulfuric ester of a natural sialo glyco peptide Bertellini, G.; Butti, A.; Piantanida, B.; Prino, G.; Riva, A.; Rossi, A.; Rossi, S. Arzneimittel-Forschung 21(2): 247-248 1971 0004-4172 https://eurekamag.com/research/027/467/027467424.php