@incollection{Szadkowski18,
author = {Zbigniew Szadkowski},
title = {Introductory Chapter: Ultrahigh-Energy Cosmic Rays},
booktitle = {Cosmic Rays},
publisher = {IntechOpen},
address = {Rijeka},
year = {2018},
editor = {Zbigniew Szadkowski},
chapter = {1},
doi = {10.5772/intechopen.79535},
url = {https://doi.org/10.5772/intechopen.79535}
}