1. Funabiki, K., K. Seido, K. Takahashi andT. Sato. 1970. A study on chromosome morphology ofPinus thunbergii andP. densiflora. Rep. For. Fac. Agr. Niigata Univ.5: 11–16. (in Japanese).
2. Furukoshi, T. andM. Sasaki. 1985. Interspecific hybridization in pines in the subsectionSylvestres Loud. Bull. For. Tree Breed. Inst.3: 21–35.
3. Hirayoshi, I., Y. Nakamura andT. Kano. 1943. Cytological and genetic studies on forest plants. II. Chromosome conjugation in pollen mother cells and pollen fertility of Aiguro-matu (Pinus deinsi-Thunbergii Ueki). Seiken Ziho2: 90–96 (in Japanese).
4. Hizume, M. 1988. Karyomorphological studies in the family Pinaceae. Mem. Fac. Educ. Ehime Univ. Ser. 3, Nat. Sci.8: 1–108.
5. —,A. Ohgiku andA. Tanaka. 1983. Chromosome banding in the genusPinus. I. identification of chromosomes inP. nigra by fluorescent banding method. Bot. Mag. Tokyo96: 273–276.