@article{IvaRud:67c,
  journal = {Mat. Vesnik},
  volume = {4 (19)},
  title = {Extensions of pseudo-{B}oolean programming},
  author = {Iv{\u{a}}nescu, Petru and Rudeanu, Sergiu},
  year = {1967},
  fjournal = {Matemati\v cki Vesnik},
  pages = {211--224},
}