@article{AM2_1980__21_182430,
     author = {Kazimierz Nikodem},
     title = {On quadratic stochastic processes.},
     journal = {Aequationes mathematicae},
     pages = {192--199},
     publisher = {mathdoc},
     volume = {21},
     year = {1980},
     zbl = {0468.60053},
     url = {http://geodesic.mathdoc.fr/item/AM2_1980__21_182430/}
}