## Outside Links

Here are outside websites on matters related to the N + k Queens Problem:

- http://liacs.leidenuniv.nl/~kosterswa/nqueens/: Walter Kosters' extensive bibliography on the n-queens problem and related problems.
__http://www.arxiv.org/abs/cs/0701049v2__: Barnaby Martin's preprint showing the NP-completeness of a problem similar to the N+k Queens Problem.__http://en.wikipedia.org/wiki/Alternating_sign_matrix__: Take a N+k Queens (or Rooks) solution, replace the pawns with -1's, the queens (rooks) with 1's and the empty squares with 0's, and you get an alternating sign matrix. The Wikipedia article includes links to some interesting papers.__http://www.amherst.edu/~nstarr/puzzle.html__: Norton Starr's pages on tiling a "deficient" board with triominoes.__http://www.maa.org/news/091508scimf.html__: Mathematical Association of America Online article about a September 5, 2008 Science article that mentions my August 1 MathFest talk and describes the N+k Queens Problem.__http://www.informatik.tu-freiberg.de/prof2/publikationen/ICAART2010_SDCP.pdf__: Christian Posthoff and Bernd Steinbach use ternary vectors to solve SAT problems. The N+k Queens Problem is used as an example.- http://file.scirp.org/pdf/OJDM_2016071414515019.pdf: "The Independence-Separation Problem on the 3-D Rook's Graph", by Paul Burchett,
*Open Journal of Discrete Mathematics*, 2016, 6, 167-173. - http://www.nnw.cz/doi/2017/NNW.2017.27.016.pdf: "Optimization of N+1 Queens Problem Using Discrete Neural Network", by M. Waqas and A.A. Bhatti,
*Neural Network World*27.3 (2017). - https://medium.freecodecamp.org/how-to-solve-the-baby-lizards-problem-a-fun-variant-on-the-n-queens-problem-a6980f5e72a Blog post on solving the Baby Lizards problem, which is similar to the N+k Queens Problem.
- https://www.canadatype.com/cc/puzzlingside/archives/Puzzling_Side_173_Season_Finale_Smorgasbord_XXIV.pdf Jeff Coakley's
*The Puzzling Side of Chess*, number 173, which includes a puzzle based on solutions to the N+k Queens Problem. - http://www.sajm-online.com/uploads/sajm10-1-1.pdf "Independence Separation on Square Hexagonal Chessboard", by K S P Sowndarya and Y Lakshmi Naidu,
*South Asian Journal of Mathematics*, 2020 , 10 (1), 1 -12.