In memory of Boris Levitan Kostyuchenko, A. G. ; Maslov, V. P. ; Sadovnichii, V. A. ; Sargsyan, I. S. ; Shkalikov, A. A. ; Zhikov, V. V. Abstract Publication: Russian Journal of Mathematical Physics Pub Date: March 2006 DOI: 10.1134/S1061920806010018 Bibcode: 2006RJMP...13....1K