"Zapiski Nauchnyh Seminarov POMI"
This issue is entitled "Investigations in Topology. Part 9"
editor A. A. Ivanov
The collection is devoted to the theory of bitopological spaces
both classical theory and general theory. It contains the book
``Bitopological spaces'' written under support of RFFI and two papers
(on bitopologies of products and ratios and on exatness of bitopological
extensions). The collection presents new ideas and results which can
be used for subsequent development of the field.