中国科学院数学与系统科学研究院期刊网
CHANGE OF POINT-TO-SET MAPS AND FAMILIES OF POINT-TO-SET MAPS FOR CONTINUITIES
Du Ding-zhu
Acta Mathematicae Applicatae Sinica . 1985, (2): 142 -150 .  DOI: 10.12387/C1985017