@article{10_37236_2845,
     author = {Afshin Behmaram and Shmuel Friedland},
     title = {Upper bounds for perfect matchings in {Pfaffian} and planar graphs},
     journal = {The electronic journal of combinatorics},
     year = {2013},
     volume = {20},
     number = {1},
     doi = {10.37236/2845},
     zbl = {1266.05116},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/2845/}
}