Relativistic quark models in the quasipotential approach

We describe the interaction of relativistic particles in the framework of the quasipotential approach. The description is based on the so-called covariant single-time formulation of quantum field theory in which the theory is considered on a spacelike three-dimensional hypersurface in the Minkowski space. Special attention is paid to methods for constructing various quasipotentials as well as to use of the quasipotential approach to describe the characteristics of relativistic particle interact ions in quark models such as the amplitudes of hadron elastic scattering, the mass spectra and widths of meson decays, and the cross sections of deep inelastic scattering of leptons on hadrons.