Before revision:  The classical and well-known framework with linear generators depending on (Y(t),Z(t)) is extended and we investigate linear generators depending on (1{t}\int_0^tY(s)ds, 1{t}\int_0^tZ(s)ds).
After revision:  The classical framework with linear generators depending on (Y(t),Z(t)) is extended and we investigate linear generators depending on (1{t}\int_0^tY(s)ds, 1{t}\int_0^tZ(s)ds).