First Results of Fast One-dimensional Hybrid Simulation of EAS Using   CONEX
  A hybrid simulation code is developed that is suited for fast one-dimensional simulations of shower profiles, including fluctuations. It combines the Monte Carlo simulation of high energy interactions with a fast numerical solution of cascade equations for the resulting distributions of secondary particles. Results obtained with this new code, called CONEX, are presented and compared to CORSIKA predictions. 
T. Pierog, M.K. Alekseeva, T. Bergmann, V. Chernatkin, R. Engel, D.   Heck, N.N. Kalmykov, J. Moyon, S. Ostapchenko, T. Thou...