00685naa#a2200181#i#450# EN\\bibl\28863 20240424175806.3 2071-7318 20190911b2019####ek#y0engy0150####ca RU IMPROVING THE EFFICIENCY OF MORTARS OF DOMESTIC PRODUCTION Journal article Belgorod Belgorod State Technological University named after V.G. Shukhov 2019 7 с. Journal article local Строительные материалы и изделия. Производство стройматериалов. 5415 tbk Onoprienko N. N. Sal'nikova O. N. bulletinbstu.editorum.ru