@article{Rud:67,
  journal = {Studia Logica},
  volume = {20},
  title = {Axiomatization of certain problems of minimization},
  author = {Rudeanu, Sergiu},
  year = {1967},
  fjournal = {Polish Academy of Sciences. Institute of Philosophy and Sociology.
              Studia Logica. An International Journal for Symbolic Logic},
  pages = {37--61},
}