@article{MV_1967_19_3_a1,
     author = {P. L. Ivanescu and S. Rudeanu},
     title = {Extensions of pseudo-boolean programming},
     journal = {Matemati\v{c}ki vesnik},
     pages = {211 },
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/MV_1967_19_3_a1/}
}