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    • New constructions for the n-queens problem 

      Bača, Martin; López Masip, Susana-Clara; Muntaner Batle, Francesc Antoni; Semaničová-Feňovčíková, Andrea (Springer, 2020-02)
      Let D be a digraph, possibly with loops. A queen labeling of D is a bijective function l:V(G)⟶{1,2,…,|V(G)|} such that, for every pair of arcs in E(D), namely (u, v) and (u′,v′) we have (i) l(u)+l(v)≠l(u′)+l(v′) and (ii) ...