[1]吕建平.Harris20-20数字程控交换机误振铃分析[J].四川电力技术,1999(S1):49-50+67.

Lü Jianping. Analysis on Error Ring In Harris 20-20 Integrated Network Switch[J]. 1999, (S1): 49-50+67.

[1]吕建平.Harris20-20数字程控交换机误振铃分析[J].四川电力技术,1999(S1):49-50+67. DOI：

Lü Jianping. Analysis on Error Ring In Harris 20-20 Integrated Network Switch[J]. 1999, (S1): 49-50+67. DOI：