We considered two types of string models: on the Riemann space of string coordinates with null torsion and on the Riemann-Cartan space of string coordinates with constant torsion. We used the hydrodynamic approach of ...

The integrability of WZNW model and string model of WZNW model type with constant SU(2) torsion is investigated. The closed boson string model in the background gravity and antisymmetric B-field is considered as integrable ...