@article{ISU_2009_9_3_a0,
     author = {D. A. Bredikhin},
     title = {On varieties of partially ordered semigroups with operations of cylindrification},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {3--7},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2009_9_3_a0/}
}