Role of relativistic kinematics in describing two-quark systems
  An attempt to incorporate relativistic kinematics in the description of light quark systems is made. It seems that the way of such incorporation along the suggestion expressed by R. Gaida and his collaborators is very promising. Comparison of these results with the experimental data concerning boson mass spectrum shows that this approach is among the best theoretical interpretation of the data. 
V. Lengyel, V. Rubish, Yu. Fekete, A. Shpenik, S. Chalupka, M. Salak