@article{SLC_1994_33_a10,
     author = {G\"unter Schaar},
     title = {Hamiltonicity {Exponent} of {Digraphs}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {33},
     year = {1994},
     url = {http://geodesic.mathdoc.fr/item/SLC_1994_33_a10/}
}