1. PhD thesis;A Bravo,1975
2. PhD thesis;GA Enriquez,1975
3. Gaytan MA, Kohashi-Shibata J (1991) Flowering in bean: number of cycles to induce anthesis and duration of the flowering stimulus in two varieties of (Phaseolus vulgaris L.). Bean Improvement Coop Annu Rep 34:80–81
4. MSc thesis;PA Gniffke,1982
5. PhD thesis;PA Gniffke,1985