00597naa#a2200181#i#450# EN\\bibl\112876 20260320172151.5 2311-1402 20150925b2015####ek#y0engy0150####ca RUS RU Evaluating the norm of the complex-valued function derivative with the convex domain of variation of the second order derivative Journal article Nizhnevartovsk Nizhnevartovsk State University 2015 5 с. Journal article local . 51-7:621.1.016 RUS Dmitriev N P filvestnik.nvsu.ru