Szukana fraza: [Abstract = The construction of a set\-valued Stratonovich\-type stochastic integral is presented in the third chapter. It bases on the construction of a forward and a backward stochastic integrals introduced by F. Russo, P. Vallois and M. Errami. A selection theorem for a set\-valued reversible stochastic process and an approximation theorem for a set\-valued Stratonovich\-type stochastic integral are the main results of this chapter.]