中国科学院数学与系统科学研究院期刊网
The Existence of the Perfect Deletion Code with Mixed Length {4, 5, 6}
Hai bo LIU, Qun Ying LIAO
Acta Mathematica Sinica, Chinese Series . 2015, (6): 977 -984 .  DOI: 10.12386/A2015sxxb0096