International Conference Days on Diffraction, Date: MAY 25-29, 2015, Location: St Petersburg, RUSSIA, Sponsors: Inst Math, St Petersburg Dept V A, St Petersburg State Univ, Euler Int Math Inst, ITMO Univ, Russian Fdn Basic Res, IEEE Russia Northwest Sect AP ED MTT Joint Chapter, Russian Acad Sci, Russian Federat, Minist Educ & Sci