@article{SLC_1985_13_a13,
     author = {Bagarret Krewerlienco and Peter Paul Roman Barnabhofer},
     title = {A {Tentative} {Answer} to the {Castel-San} {Pietro} {Problem}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1985},
     volume = {13},
     url = {http://geodesic.mathdoc.fr/item/SLC_1985_13_a13/}
}