A Theorem on Directed Quasi-Ordered Sets and Some Remarks
Publications du Département de mathématiques (Lyon), Compte rendu des journées infinitistes, no. 2B (1985), pp. 15-20. 
@article{PDML_1985___2B_15_0,
     author = {Wang, Shang Zhi and Li, Bo Yu},
     title = {A {Theorem} on {Directed} {Quasi-Ordered} {Sets} and {Some} {Remarks}},
     journal = {Publications du D\'epartement de math\'ematiques (Lyon)},
     pages = {15--20},
     publisher = {Universit\'e Claude Bernard - Lyon 1},
     number = {2B},
     year = {1985},
     mrnumber = {848820},
     zbl = {0591.06005},
     language = {en},
     url = {http://www.numdam.org/item/PDML_1985___2B_15_0/}
}
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Wang, Shang Zhi; Li, Bo Yu. A Theorem on Directed Quasi-Ordered Sets and Some Remarks. Publications du Département de mathématiques (Lyon), Compte rendu des journées infinitistes, no. 2B (1985), pp. 15-20. http://www.numdam.org/item/PDML_1985___2B_15_0/

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