@article{10_37236_1813,
     author = {A. Del Lungo and E. Duchi and A. Frosini and S. Rinaldi},
     title = {On the generation and enumeration of some classes of convex polyominoes},
     journal = {The electronic journal of combinatorics},
     year = {2004},
     volume = {11},
     number = {1},
     doi = {10.37236/1813},
     zbl = {1053.05006},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/1813/}
}