@article{AM2_1979__19_136844,
     author = {Kazimierz Nikodem},
     title = {On quadratic stochastic processes {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {317--318},
     publisher = {mathdoc},
     volume = {19},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/AM2_1979__19_136844/}
}