tétraquark
2005 / Exotica / R.L. Jaffe / Physics Reports 409 (2005) p. 1 [doi]
2007 / Glueballs, hybrids, multiquarks: Experimental facts versus QCD inspired concepts / Eberhard Klempt ; Alexander Zaitsev / Physics Reports 454 (2007) p. 1 [doi]
2014 / [Quick Study] Exotic particles with four or more quarks / Stephen Lars Olsen / Physics Today 67 (2014) p. 56 [doi]