@article{JAC_1997__6_3_a4,
     author = {Knuth, Donald E.},
     title = {Aztec diamonds, checkerboard graphs, and spanning trees},
     journal = {Journal of Algebraic Combinatorics},
     pages = {253--257},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_1997__6_3_a4/}
}