TY JOUR TI A Methodological Approach to the Integral Assessment of the Quality of Customs Services KW quality of public services KW customs administration KW integral index KW digitalization KW process efficiency KW service satisfaction KW customs control effectiveness KW client-centered approach KW assessment methodology KW customs services JO Russian Journal of Management AU Fal'chenko, O.D. AU Stremousova, E.G. PY 2025 IS 13 PB Publishing Center RIOR