  A translation from Russian of the work of R.R. Kamalian "Interval colorings
of complete bipartite graphs and trees", Preprint of the Computing Centre of
the Academy of Sciences of Armenia, Yerevan, 1989. (Was published by the
decision of the Academic Council of the Computing Centre of the Academy of
Sciences of Armenian SSR and Yerevan State University from 7.09.1989).
