@inproceedings{Petrov:20214h, author = "Petrov, Igor and Knurenko, Stanislav", title = "{On the nature of particles that produces extensive air showers with energy greater than 5 EeV}", doi = "10.22323/1.395.0290", booktitle = "Proceedings of 37th International Cosmic Ray Conference {\textemdash} PoS(ICRC2021)", year = 2021, volume = "395", pages = "290" }