@article{ZNSL_2007_344_a4,
     author = {I. N. Ponomarenko and A. Rahnamai Barghi},
     title = {On the structure of $p$-schemes},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {190--202},
     publisher = {mathdoc},
     volume = {344},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2007_344_a4/}
}