@article{MM3_2000_4_1_a15,
     author = {Janez U\v{s}an},
     title = {On {(n,m)-Groups}},
     journal = {Mathematica Moravica},
     pages = {115 - 118},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {2000},
     url = {https://geodesic-test.mathdoc.fr/item/MM3_2000_4_1_a15/}
}