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Seth Chaiken, ChristopherR.H. Hanusa, and Thomas Zaslavsky
A q-Queens Problem. II. The square board
Journal of Algebraic Combinatorics 41(3), 619-642, 2015

Jordan Bell and Brett Stevens
A survey of known results and research areas for -queens
Discrete Mathematics 309(1), 1 - 31, 2009

Jieh Hsiang, D.Frank Hsu, and Yuh-Pyng Shieh
On the hardness of counting problems of complete mappings
Discrete Mathematics 277(1–3), 87 - 100, 2004