Leslie, G.B., Frasdillla, J.C., Salmon, G.K. and Sturman, G. (1988) The Effect of Lifetime Treatment with a Herbal Yeast Food Supplement (Bio-Strath®) on Survival and Infection Resistance in Mice. SWISS MED, 10, 36-38.
 Joller, P.W., Schwarzenberg, M. and Cogoli, A. (2000) Mode of Action of Plasmolysed Yeast on Lymphocytes under Microgravity Stress Immunological Investigation. Immunological Investigation, 29, 355-364.
 Schwarzenberg, M., Joller, P. and Cogoli, A. (2000) Stress-Compensation by a Food Supplement Based on Yeast Plasmolysate in Mitogen Activated T-Lymphocytes under Simulated Low-Gravity. Biological Sciences in Space, 14, 3-8.
 Gmünder, F.K. (1990) Effect of a Herbal Yeast Food Supplement and Long-Distance Running on Immunological Parameters. British Journal of Sports Medicine, 24, 103-112.