1. BOTAR, J., and PRIBEK, L. (1935). Ann. Anat. Path. (Par-is), 12, 227.
2. CHRISTOPHERSON, W. M., FooTE, F. W., Jr., and STEWART, F. W. (1952). Cancer, 5, 100.
3. Histological Appearances of Tumours;EVANS, R.,1956
4. FISHER, E. R., and HAzARD, J. B. (1952). Cancer, 5, 521.
5. Personal communication;HAZARD, J.B.,1962