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On the principle of planning and the principle of contract freedom in our country's Contract Law
Liang, Huixing, (1985)
Dăržavno upravlenie i samoupravlenie na stopanskata dejnost : naučnopraktičeska konferencija ; 8 - 9 oktomvri 1987 g.
Račev, Filip, (1988)
Plan i dogovor : materialʹnoe stimulirovanie
Sejnaroev, Beksultan M., (1989)
A tentative theory on the principle of compensation in our country's economic contracts
Li, Zhuguo, (1985)
Several questions concerning economic contracts
Bai, Youzhong, (1985)