EAS primary particle parameter estimation with the complex Pamir-XXI detector arrayV.I. Galkin, A.S. Borisov, R. Bakhromzod, V.V. Batraev, S. Latipova and A. MuqumovEPJ Web Conf., 145 (2017) 15004DOI: https://doi.org/10.1051/epjconf/201614515004