中国科学院数学与系统科学研究院期刊网
A SUFFICIENT AND NECESSARY CONDITION FOR A DISTRIBUTION OF INDEPENDENT SUM TO BE CONTINUOUS AND ITS APPLICATION TO TIME SERIES
Ma Zhi-ming, An Wan-fu
Acta Mathematicae Applicatae Sinica . 1985, (2): 204 -209 .  DOI: 10.12387/C1985023