1. Bi, F. C. (2004).Determination of the Genotypes of 15 Main Cultivars and Isolation of theS29-RNaseGene from Chinese Bretschnider Pear (Pyrus bretschneideri).M. S.Thesis. Central-South Forestry University, Changsha, P. R. China. 62 pp. (In Chinese.)
2. Gu, Q. Q. (2006).Identification of Self-Incompatible Genotypes in Some Japanese Pears (Pyrus pyrifoliaNakai) by PCR-RFLP. M. S. Thesis. Huazhong Agricultural University, Wuhan, P. R. China. 59 pp. (In Chinese.)
3. Liang, W. J. (2008). S-Genotyping Fifteen Pear Cultivars and Cloning Two Full-Length cDNAs EncodingS22-RNaseandS42- RNase. M. S. Thesis. Central-South Forestry University, Changsha, P. R. China. 70 pp. (In Chinese.)
4. Zhang, Y. Y. (2007).Analysis of Genetic Relationships and Identification ofS-Genotypes and Cloning ofS-RNaseGenes inPyrus. Ph.D. Thesis. Nanjing Agricultural University, Nanjing, P. R. China. 119 pp. (In Chinese.)