中国科学院数学与系统科学研究院期刊网
Harmoning Oscillation to Discrete Singular Systems
Jia Rong LIANG(1),Yong Qing LI
Acta Mathematica Sinica, Chinese Series . 2002, (3): 551 -556 .  DOI: 10.12386/A2002sxxb0070