@article{Urbanowski:1979,
  author  = "K. Urbanowski",
  title   = "On some method of calculation of a "quasipotential" governing the time evolution of a distinguished component of the state vector",
  journal = "Bulletin de l'Académie Polonaise des Sciences : Série des Sciences Physiques et Astronomiques",
  volume  = "Vol. 27",
  number  = "no 3",
  pages   = "155--161",
  year    = "1979",
}