Bohr, Henrik; Nielsen, H. B. (1977). "Hadron production from a boiling quark soup: quark model predicting particle ratios in hadronic collisions". Nuclear Physics B. 128 (2): 275. बिबकोड:1977NuPhB.128..275B. डीओआई:10.1016/0550-3213(77)90032-3.
Bohr, Henrik; Nielsen, H. B. (1977). "Hadron production from a boiling quark soup: quark model predicting particle ratios in hadronic collisions". Nuclear Physics B. 128 (2): 275. बिबकोड:1977NuPhB.128..275B. डीओआई:10.1016/0550-3213(77)90032-3.