8Terami H, Torikata H, Shimazu Y. Analysis of the sterility faeeors existing in varieties of the Japanese pear (Pyrus serotina)[J].Studies Hort. Inst. Kyoto Imp. Univ., 1946,3:267 - 271.
9Machida Y. Morphologicsl and physiological characteristics of Japanese and Chinese pear[A]. In: Sato K, et al. Dictionary of pomology[C] . Yokendo, Tokyo. ( In Janpanese) . 1972, 527 -529.
10Sonneveld T. Detecting incompatibility alleles in sweet cherry (Prunnus avium)-analyses of stylar ribonueleases and testcrosses at East Malling[R]. 1996.
