@article{NSJOM_1981_11_Nonea_28,
     author = {Marcu 

 D\u{a}nut},
     title = {Note on the spanning trees of a 

 connected digraph},
     journal = {Novi Sad Journal of Mathematics},
     pages = {297-303},
     publisher = {mathdoc},
     volume = {11},
     year = {1981},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1981_11_Nonea_28/}
}