@article{SLC_1981_05_a6,
     author = {Peter Kirschenhofer},
     title = {\"Uber die mittlere {H\"ohe} von monoton gelabelten {Wurzelb\"amen}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1981},
     volume = {05},
     url = {http://geodesic.mathdoc.fr/item/SLC_1981_05_a6/}
}