@article{JIS_2008__11_1_a4,
     author = {Blasiak,  P. and Dattoli,  G. and Horzela,  A. and Penson,  K.A. and Zhukovsky,  K.},
     title = {Motzkin numbers, central trinomial coefficients and hybrid polynomials},
     journal = {Journal of integer sequences},
     year = {2008},
     volume = {11},
     number = {1},
     zbl = {1165.11027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2008__11_1_a4/}
}