References
- Bootsma D., Budke L., Vos O. 1964; 33: 301–301
- Galavazi G., Bootsma D. 1966; 41: 438–438
- Galavazi G., Schenk H.A.E.M., Bootsma D. 1966; 41: 428–428
- Veen J.van der, Bots L., Mes A. 1958; 8: 230–230
- Vos O., Schenk H.A.E.M., Bootsma D. 1967; 11: 495–495