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* ニホンナシ育成品種の系統図 (cultivar trees of japanese pears), national institute of fruit tree science, japan* shin hiratsuka, shao-ling zhang "relationships between fruit set, pollen-tube growth, and s-rnase concentration in the self-incompatible japanese pear" "scientia horticulturae", 95 (4), 309-318 (2002).
* ニホンナシ育成品種の系統図 (cultivar trees of japanese pears), national institute of fruit tree science, japan* shin hiratsuka, shao-ling zhang "relationships between fruit set, pollen-tube growth, and s-rnase concentration in the self-incompatible japanese pear" "scientia horticulturae", 95 (4), 309-318 (2002).