@article{PIM_2012_N_S_91_105_a5,
     author = {Jovo Jari\'c},
     title = {On {Gauss-Bonnet} {Theorem}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {59 },
     publisher = {mathdoc},
     volume = {_N_S_91},
     number = {105},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_2012_N_S_91_105_a5/}
}