1. L.J. Alı́as, P. Mira, The Björling problem for minimal surfaces in Rn and its applications (in preparation)
2. S. Alves, R.M.B. Chaves, P. Simoes, Björling's problem for minimal surfaces in R4 (in preparation)
3. In integrationem aequationis derivatarum partialum superfici, cujus in puncto unoquoque principales ambo radii curvedinis aequales sunt sngoque contrario;Björling;Arch. Math. Phys.,1844
4. Complete minimal surfaces in Euclidean n-space;Chern;J. Analyse Math.,1967
5. Minimal Surfaces I;Dierkes,1992