2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/172266This note collects formulas relative to the energy dependence of the cross sections for open charm and $J/ψ$ production for $NN$-collisions at threshold. It is a basis for the best input to MonteCarlo calculations, for associative charm particle production in nucleon-nucleon, nucleon-nucleus, ion-ion and proton-antiproton collisions.12 pages 5 figures Rapport DAPNIA-03-477 (2003)High Energy Physics - Phenomenologytext