1. Heck D, Knapp J (1998) Upgrade of the Monte Carlo code CORSIKA to simulate extensive air showers with energies > 1020 eV. FZKA-6097B Forschungszentrum Karlsruhe.
2. COSMOS: Monte Carlo simulation code for propagation of cosmic rays in the atmosphere and near earth environment. 2016 May 12. Available: http://cosmos.n.kanagawa-u.ac.jp/cosmosHome/
3. The atmospheric cosmic- and solar energetic particle radiation environment at aircraft altitudes;K O'Brien;Adv Space Res,1998
4. Calculation of radiation fields in the atmosphere and comparison to experimental data;S Roesler;Radiat Res,1998
5. Terrestrial cosmic ray intensities;JF Ziegler;IBM J Res Dev,1998