TY JOUR TI Mathematical model for calculation of data sources in building membership function in problems of estimating reliable hydrocarbon reserves KW fuzzy relations KW reliability assessment KW hydrocarbon reserves KW number of data sources KW stray field KW density map JO Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics AU Kozhevnikova, P.. AU Kuntsev, V.. AU Chuvashov, A.. PY 2023 IS PB Astrakhan State Technical University