No muon excess in extensive air showers at 100-500 PeV primary energy:   EAS-MSU results
  Some discrepancies have been reported between observed and simulated muon content of extensive air showers: the number of observed muons exceeded the expectations in HiRes-MIA, Yakutsk and Pierre Auger Observatory data. Here, we analyze the data of the Moscow State University Extensive Air Shower (EAS-MSU) array on E_mu>~10 GeV muons in showers caused by ~(10^17-10^18) eV primary particles and demonstrate that they agree with simulations (QGSJET-II-04 hadronic interaction model) once the primary composition inferred from the surface-detector data is assumed. 
Yu.A. Fomin, N.N. Kalmykov, I.S. Karpikov, G.V. Kulikov, M.Yu.   Kuznetsov, G.I. Rubtsov, V.P. Sulakov, S.V. Troitsky
astro-ph.HE