@article{TSG_1988-1989__7__31_0,
     author = {Richard, Jean-Marc},
     title = {Ordre des niveaux des syst\`emes quark-antiquark et des syst\`emes de 3 quarks},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {31--32},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {7},
     year = {1988-1989},
     language = {fr},
     url = {http://archive.numdam.org/item/TSG_1988-1989__7__31_0/}
}