1. Bittner, John J. Rapers of the Mich. Ac. of Science, Arts and Letters 11: 349, 1929.
2. Cloudman, A. M. Am. J. Cancer 16: 568, 1932.
3. Keeler, Cl. E. The laboratory mouse. Harvard University Press. Cambridge 1931.
4. Korteweg, R. Paper read at the meeting of the Gen. van Nat., Gen. en Heelkunde; Nov. 22nd, 1933; without change published Ned. Tijdschr. v. Geneesk. 78: 240, 1934.
5. Korteweg, R. Ned. Tijdschr. v. Geneesk. 79: 1482, 1935.