AN EXTENSION THEOREM IN THE THEORY OF REGULAR TILINGS AND ITS APPLICATIONS Article Dolbilin N.P., Makarov V.S., Zamorzaeva Elizaveta Труды Математического института им. В.А. Стеклова РАН. 2002.
NECESSARY CONDITIONS FOR AN EXTREMUM AND AN INVERSE FUNCTION THEOREM WITHOUT A PRIORI NORMALITY ASSUMPTIONS Article Arutyunov A.V., Shapiro Alexander Труды Математического института им. В.А. Стеклова РАН. 2002.