00694naa#a2200193#i#450# EN\\bibl\36399 20241227102233.5 2686-9896 20200605b2020####ek#y0engy0150####ca RU DETERMINATION OF THE COEFFICIENT OF EFFICIENCY OF BRIGHTENING ADDITIVES Journal article Angarsk Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University» 2020 1 с. Химия. 04.03.01 local Journal article local Sosnovskaya Nina Gennad'evna Mihaylova Alena Sergeevna Cyrenova Ol'ga Anatol'evna angtu.editorum.ru