1. Enrico Fermi, High Energy Nuclear Events, Progress of Theoretical Physics 5 (1950) 570
   File : PTP_5_1950_570.pdf
   Spires link
2. Margaret C. Foster et al., Azimuthal Correlations of High-Energy Collision Products, Phys. Rev. D 6 (1972) 3135
   File : PRD_6_1972_3135.pdf
   Spires link
3. F. Cerulus, Consequences of a Strong pion-pion Interaction in the Statistical Theory of p-pbar Annihilation, IL Nuovo Cimento 14 (1959) 827
   File : NC_14_1959_827.pdf
4. R. Hagedorn, A New Derivation of the Statistical Theory of Particle Production with Numerical Results for p-p Collisions at 25 GeV, IL Nuovo Cimento 15 (1960) 434
   File : NC_15_1960_434.pdf
5. F. Bonsignori and F. Selleri, Pion Cloud Effects in Pion Production Experiments, IL Nuovo Cimento 15 (1960) 465
   File : NC_15_1960_465.pdf
6. R. Hagedorn, Production of Antideuterons, Light Nuclei and Hyperfrragments in High-Energy pp-Collisions, IL Nuovo Cimento 25 (1962) 1015
   File : NC_25_1962_1017.pdf

Numerical methods to calculate phase space integrals.

1. F. Cerulus and R. Hagedorn, A Monte-Carlo Method to Calculate Multiple Phase Space Integrals - II, IL Nuovo Cimento (Sup2) 9 (1958) 646
   File : NC_9_Sup2_646.pdf
2. M. M. Block, Phase-Space Integrals for Multiparticle Systems, Phys. Rev. 101 (1956) 796
   File : PR_101_1956_796.pdf
3. G.E.A. Fialho, Phase Space Calculations, Phys. Rev. 105 (1957) 328
   File : PR_105_1957_328.pdf