Study of the EAS size spectrum in thermal neutrons measured by the PRISMA-YBJ array Oleg Shchegolev, Victor Alekseenko, Anastasia Bagrova, Yayun He, Bingbing Li, Shuwang Cui, Xinhua Ma, Yuri Stenkin and Vladimir Stepanov EPJ Web Conf., 145 (2017) 19021 Published online: 26 June 2017 DOI: 10.1051/epjconf/201714519021