@article{NSJOM_2004_34_2a_8,
     author = {D. Joji\'c},
     title = {A note about 

 shellable planar posets},
     journal = {Novi Sad Journal of Mathematics},
     pages = {119-125},
     year = {2004},
     volume = {34},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2004_34_2a_8/}
}