@article{SLC_2011-2012_65_a2,
     author = {Pawel Blasiak and Philippe Flajolet},
     title = {Combinatorial {Models} of {Creation-Annihilation}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {65},
     year = {2011-2012},
     url = {http://geodesic.mathdoc.fr/item/SLC_2011-2012_65_a2/}
}