Properties of tangential and radial angles of muons in EAS
  Tangential and radial angles of muons in EAS, a useful concept in investigation of the muon production height, can be used also for the investigation of the muon momenta. A parameter zeta, being a combination of tangential and radial angles, is introduced and its possible applications in investigation of muons in showers are presented. 
J.Zabierowski (Soltan Institute for Nucl.Studies, Lodz, Poland),   K.Daumiller (University of Karlsruhe, Germany), P.Doll (F...