Torbjörn Sjöstrand, P. Edén, Christer Friberg, Leif Lönnblad, Gabriela Miu, S. Mrenna, E. Norrbin (2001). High-energy-physics event generation with Pythia 6.1. Computer Physics Communications. https://doi.org/10.1016/s0010-4655(00)00236-8