1. Abderhalden, E., u.R. Merkel: Weitere Studien über das Vorhandensein einer Prolinase. Fermentforsch.15, 1?23 (1936).
2. Ackerman, G. A., R. A. Knouff andH. A. Hoster: Cytochemistry and morphology of neoplastic and nonneoplastic human lymph node cells with special reference to Hodgkin's disease. J. nat. Cancer Inst.12, 465?489 (1951).
3. Ammon, R.: Die Esterasen. InAmmon u.Dirscherl, Fermente, Hormone, Vitamine, Bd. I, Fermente S. 99. Stuttgart: Georg Thieme 1959.
4. Baker, J. R., andW. H. Fishman: Effects of chloral-formol fixation on preservation and localization of five enzymes. J. Histochem. Cytochem.6, 85?86 (1958).
5. Braunstein, H.: Histochemistry of lymphocytic tissue in the malignant lymphomas. In: The lymphocyte and lymphocytic tissue. Edit. byJ. W. Rebuck. New York: P. B. Hoeber, 1960.