@article{DM_2009_21_2_a4,
     author = {I. K. Sharankhaev},
     title = {On repetition-free {Boolean} functions over pre-elementary monotone bases},
     journal = {Diskretnaya Matematika},
     pages = {88--93},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2009_21_2_a4/}
}