(1)
Atta, S.; Goldstein, S.; Sinha Mahapatra, P. R. No-Hole λ-L (k, K – 1, …, 2,1)-Labeling for Square Grid. Bulletin 2017, 67 (3), 9-19. https://doi.org/10.26485/0459-6854/2017/67.3/1.