On (s, t)(s, t)-relaxed L(2, 1)L(2, 1)-labelings of the square lattice. - Benqiu Dai; Wensong Lin (Inf. Process. Lett., 2013)

On (s, t)-relaxed L(2, 1)-labelings of the triangular lattice. - Wensong Lin; Benqiu Dai (J. Comb. Optim., 2015)

On (s, t)-relaxed L(2, 1)-labelings of the hexagonal lattice. - Benqiu Dai; Wensong Lin (Ars Comb., 2017)