@inproceedings { Gutman19890906,
  author = "Gutman A.E.",
  title = "On disjointness preserving operators in Banach--Kantorovich spaces",
  booktitle = "XIV School on the theory of operators in function spaces (Novgorod, September 6--14, 1989): Proceedings",
  address = "Novgorod",
  year = "1989",
  volume = "1",
  pages = "75",
  language = "russian",
  annote = "For a disjointness preserving linear operator acting from an arbitrary Banach--Kantorovich space in a universally complete Banach--Kantorovich space the equivalence is established of its $r$-$o$-continuity, $r$-continuity, majorizability, and multiplicativity on principal ideals."
}