杨开忠，谢燮，厂商数目有限交易费用不同的垄断竞争的空间模型，系统工程，2005年；
Space models for Monopoly Competition: Under Limited Number of Companies and Different Cost of Trade, Systems Engineering, 2005
杨开忠，谢燮，厂商数目有限交易费用不同的垄断竞争的空间模型，系统工程，2005年；
Space models for Monopoly Competition: Under Limited Number of Companies and Different Cost of Trade, Systems Engineering, 2005
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