@article{GeoVra:71a,
  journal = {Stud. Cerc. Mat.},
  volume = {23},
  title = {Monadic {B}oolean algebras and monadic \L ukasiewicz algebras},
  author = {Georgescu, George and Vraciu, Constantin},
  year = {1971},
  fjournal = {Studii \c si Cercet\u ari Matematice},
  pages = {1025--1048},
}