@article{ISU_2017_17_1_a2,
     author = {A. O. Petrikov},
     title = {A minimal non-extendable partial semigroup},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {31--39},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {2017},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2017_17_1_a2/}
}