Mechanisms for ensuring the sustainable development of postal companies based on their strategic competitive advantagesKulman Orazbayeva, Mussa Niyazov, Gulder Abayeva, Batyr Orazbayev and Aruana AkishevaE3S Web of Conf., 402 (2023) 09026DOI: https://doi.org/10.1051/e3sconf/202340209026