TY - JOUR AU - R. F. Fikhmanas AU - P. Sh. Fridberg TI - Two-sided variation estimates for polarizability coefficients in the theory of diffraction at small apertures JO - Doklady Akademii Nauk PY - 1969 SP - 969 EP - 972 VL - 189 IS - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1969_189_5_a12/ LA - ru ID - DAN_1969_189_5_a12 ER -