1. Ahlfors, L.V.: Complex Analysis, Third, McGraw-Hill Book Co., New York (1978). An Introduction to the Theory of Analytic Functions of One Complex Variable, International Series in Pure and Applied Mathematics. MR510197
2. Akamine, S.: Causal characters of zero mean curvature surfaces of Riemann type in the Lorentz- Minkowski 3-space, Kyushu J. Math. 71 (2017), no. 2, 211–249. MR3727218
3. Akamine, S., Fujino, H.: Duality of boundary value problems for minimal and maximal surfaces. arXiv: 1909.00975
4. Akamine, S., Umehara, M., Yamada, K.: Space-like maximal surfaces containing entire null lines in Lorentz-Minkowski 3-space. Proc. Japan Acad. Ser. A Math. Sci. 959, 97–102 (2019). MR4026357
5. Alías, L.J., Chaves, R.M.B., Mira, P.: Björling problem for maximal surfaces in Lorentz- Minkowski space. Math. Proc. Cambridge Philos. Soc. 134(2), 289–316 (2003). MR1972140