G. H. Harris, J. J. H. Forster. On the Number of Solutions, S(k, n), to a Class of Crossword Puzzles. Comput. J., 35(Additional-Papers), 1992.
@article{HarrisF92, title = {On the Number of Solutions, S(k, n), to a Class of Crossword Puzzles}, author = {G. H. Harris and J. J. H. Forster}, year = {1992}, researchr = {https://researchr.org/publication/HarrisF92}, cites = {0}, citedby = {0}, journal = {Comput. J.}, volume = {35}, number = {Additional-Papers}, }