00754naa#a2200217#i#450# EN\\bibl\132522 20260804145021.2 3034-4689 20260702b2026####ek#y0engy0150####ca RU CALIBRATION OF MEASURING INSTRUMENTS FOR TRANSMITTANCE COEFFICIENTS AND OPTICAL DENSITY USING A SECONDARY STANDARD AND AUTOMATED PROCESSING OF MEASUREMENT DATA Journal article Kazan Kazan National Research Technological University 2026 6 с. Journal article local Zharavina K. O. Lavrinov S. V. Lyadov M. A. Petrova E. V. Dresvyannikov Aleksandr Fedorovich Koldybaeva N. N. vestniktu.ru