@article{10_37236_630,
     author = {Zhicheng Gao and Andrew MacFie and Daniel Panario},
     title = {Counting words by number of occurrences of some patterns},
     journal = {The electronic journal of combinatorics},
     year = {2011},
     volume = {18},
     number = {1},
     doi = {10.37236/630},
     zbl = {1227.05016},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/630/}
}