EAS primary particle parameter estimation with the complex Pamir-XXI detector array V.I. Galkin, A.S. Borisov, R. Bakhromzod, V.V. Batraev, S. Latipova and A. Muqumov EPJ Web Conf., 145 (2017) 15004 Published online: 26 June 2017 DOI: 10.1051/epjconf/201714515004