1. Blomquist, A. W. and F. I. Lauer. 1962. Evaluation of frost resistance using detached leaves in populations ofSolanum acaule—S. tuberosum hybrids. Amer. Potato J. 39:389 (abst.).
2. Brücher, H. 1963. From the original home of our cultivated potato. I. Wild relatives ofSolanum tuberosum (In German). Kartoffelbau 14:212–214.
3. Correll, D. S. 1962. The potato and its wild relatives. Section Tuberarium of the genusSolanum. Texas Research Foundation, Renner, Texas. 606 p.
4. Dearborn, C. H. 1963. Frost resistance in potato foliage in relation to age of tops. Amer. Potato J. 40:323 (abst.).
5. Firbas, H. 1962. Connection beteen dryness and frost resistance (In German). Z. Pflanzenzuch. 48:29–35.