@article{10_4153_CMB_1997_006_7,
     author = {Kechagias, Nondas E.},
     title = {A {Note} on {Un} {\texttimes} {Um} {Modular} {Invariants}},
     journal = {Canadian mathematical bulletin},
     pages = {54--59},
     year = {1997},
     volume = {40},
     number = {1},
     doi = {10.4153/CMB-1997-006-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1997-006-7/}
}