@article{ADM_2006_1_a5,
     author = {Janusz Konrad Slupik},
     title = {Classification of inverse semigroups generated by two-state partially defined invertible automata over the two-symbol alphabet},
     journal = {Algebra and discrete mathematics},
     pages = {67--80},
     publisher = {mathdoc},
     number = {1},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2006_1_a5/}
}