@article{NSJOM_1979_9_Nonea_14,
     author = {Stojakovi\'c Mirko},
     title = {On a formal 

 language for group theory},
     journal = {Novi Sad Journal of Mathematics},
     pages = {101-104},
     publisher = {mathdoc},
     volume = {9},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1979_9_Nonea_14/}
}