1. Friend C (1957) J Exp Med 105:307–318
2. Stansly PG, Soule HD (1962) J Natl Cancer Inst 29:1083–1106
3. Rauscher FJ (1962) J Natl Cancer Inst 29:515–543
4. Kirsten WH, Mayer LA (1967) J Natl Cancer Inst 39:311–335
5. Kirsten WH, Mayer LA, Wollmann RL, Pierce (1967) J Natl Cancer Inst 38:117–139