Full Monte-Carlo description of the Moscow State University Extensive   Air Shower experiment
  The Moscow State University Extensive Air Shower (EAS-MSU) array studied high-energy cosmic rays with primary energies ~(1-500) PeV in the Northern hemisphere. The EAS-MSU data are being revisited following recently found indications to an excess of muonless showers, which may be interpreted as the first observation of cosmic gamma rays at ~100 PeV. In this paper, we present a complete Monte-Carlo model of the surface detector which results in a good agreement between data and simulations. The model allows us to study the performance of the detector and will be used to obtain physical results in further studies. 
Yu.A. Fomin, N.N. Kalmykov, I.S. Karpikov, G.V. Kulikov, M.Yu.   Kuznetsov, G.I. Rubtsov, V.P. Sulakov and S.V. Troitsky
astro-ph.HE astro-ph.IM