@article{KYB_1985__21_2_a2,
     author = {Chien, Tran Quoc},
     title = {Duality and optimality conditions in abstract concave maximization},
     journal = {Kybernetika},
     pages = {108--117},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1985},
     mrnumber = {797324},
     zbl = {0569.90086},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1985__21_2_a2/}
}