@article{PIM_1979_N_S_26_40_a31,
     author = {Slavi\v{s}a B. Pre\v{s}i\'c},
     title = {On {Quasi-Algebras} {And} {The} {Word} {Problem}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {255 },
     year = {1979},
     volume = {_N_S_26},
     number = {40},
     url = {http://geodesic.mathdoc.fr/item/PIM_1979_N_S_26_40_a31/}
}