1. G. S. Inikhov and A. F. Shoshin. Trudy Vologdsk. Molochno-Khoz. Inst., No. 64, 159 (1926).
2. C. H. Chu, Anat. Rec.108, 723 (1950).
3. F. Feigl, Qualitative Analysis by Spot Tests (New York, 1947).
4. T. Fellenberg, Mitt. Lebensmitt,15, 198 (1924).
5. J. Glavind, et al., Experientia5, 84 (1949).