@article{10_37236_1150,
     author = {William Y. C. Chen and Sherry H. F. Yan},
     title = {Noncrossing trees and noncrossing graphs},
     journal = {The electronic journal of combinatorics},
     year = {2006},
     volume = {13},
     doi = {10.37236/1150},
     zbl = {1098.05022},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1150/}
}