1. Weigert C. Fortschr Med. [1887] 5.193.
2. Page I.H. [1968] In: Serotonin. Yearbook Med Publ Inc. Chicago. 37
3. Dekhuyzen M.C. [1901] Anat Anz.19.529.
4. Tullis J.L. [1953] Blood cells and plasma protein. Acad Press Inc. N York.
5. Tocantins L.M. [1960] In: Blood Platelets. Ed: Johnson S.A. et al. Little Brown and Co. Boston pp3–6