no. 2
Programming with parametric elements of the matrix coefficients
RAIRO - Operations Research - Recherche Opérationnelle, Tome 11 (1977) no. 2, pp. 233-238 
@article{RO_1977__11_2_233_0,
     author = {Arana, Ramon M.},
     title = {Programming with parametric elements of the matrix coefficients},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {233--238},
     year = {1977},
     publisher = {EDP Sciences},
     volume = {11},
     number = {2},
     mrnumber = {444052},
     zbl = {0356.90074},
     language = {en},
     url = {https://www.numdam.org/item/RO_1977__11_2_233_0/}
}
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Arana, Ramon M. Programming with parametric elements of the matrix coefficients. RAIRO - Operations Research - Recherche Opérationnelle, Tome 11 (1977) no. 2, pp. 233-238. https://www.numdam.org/item/RO_1977__11_2_233_0/

1. H. Maurin, Paramétrisation Générale d'un Programme Linéaire (Thèse présentée le 19/6/ 1963 à la Fac. des Sciences de l'Université de Paris).