@article{PIM_1977_N_S_21_35_a26,
     author = {Marica D. Pre\v{s}i\'c and Slavi\v{s}a B. Pre\v{s}i\'c},
     title = {On {The} {Embedding} {Of} {\ensuremath{\Omega}-Algebras} {In} {Groupoids}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {169 },
     publisher = {mathdoc},
     volume = {_N_S_21},
     number = {35},
     year = {1977},
     url = {http://geodesic.mathdoc.fr/item/PIM_1977_N_S_21_35_a26/}
}