Baltz, A., Hegarty, P., Knape, J., Larsson, U. and Schoen, T. (2005) “The Structure of Maximum Subsets of $\{1,\ldots,n\}$ with No Solutions to $a+b = kc$”, The Electronic Journal of Combinatorics, 12(1), p. R19. doi: 10.37236/1916.