TY JOUR TI Heuristic assessment of service quality: case of mobile communication operators KW quality of mobile communication services KW coded values of service characteristics KW ranking KW relative characteristics of services KW quality markers JO Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics AU Nikulin, V.. AU Afonin, V.. PY 2023 IS PB Astrakhan State Technical University