Gauge transformation and reciprocal link for (2+1)-dimensional integrable field systems

Appropriate restrictions of Lax operators which allows to construction of (2+1)-dimensional integrable field systems, coming from centrally extended algebra of pseudo-differential operators, are reviewed. The gauge transformation and the reciprocal link between three classes of Lax hierarchies are established.Comment: to appear in J. Nonl. Math. Phys., 12 page