中国科学院数学与系统科学研究院期刊网
CONSTRUCTION OF ASSOCIATION SCHEMES WITH SEVERAL ASSOCIATION CLASSES BASED ON SYMMETRIC MATRICES
Huo Yuan-ji, Zhu Xue-li
Acta Mathematicae Applicatae Sinica . 1987, (3): 257 -266 .  DOI: 10.12387/C1987032