Tetraquark bound states in a constituent quark model and the nature of   the a_0(980) and f_0(980)
  In this work we study tetraquark bound states in the framework of the constituent quark model of Ref. [2], which has been used for the description of non-strange two- and three-baryon systems and later on applied to the hadron spectra. 
J. Vijande, F. Fernandez, A. Valcarce and B. Silvestre-Brac