Weierstrass representation of Lagrangian surfaces in four-dimensional space using spinors and quaternions

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Frédéric Hélein, P. Romon, Weierstrass representation of Lagrangian surfaces in four-dimensional space using spinors and quaternions. Comment. Math. Helv. 75 (2000), no. 4, pp. 668–680

DOI 10.1007/S000140050144