1. Bernstein, S.: On the left linear Riemann problem in Clifford analysis. Bull. Belg. Math. Soc. 3, 557–576 (1996)
2. Zhang, Z., Du, J.: On certain Riemann boundary value problems and singular integral equations in Clifford analysis. Chin. Ann. Math. 22A, 421–426 (2000)
3. Xu, Z.: On linear and nonlinear Riemann–Hilbert problems for regular functions with values in a Clifford algebra. Chin. Ann. Math. Ser. B 11(3), 349–358 (1990)
4. Abreu Blaya, R., Bory Reyes, J.: On the Riemann Hilbert type problems in Clifford analysis. Adv. Appl. Clifford Algebras 11(1), 15–26 (2001)
5. Bory Reyes, J., Abreu Blaya, R.: The quaternionic Riemann problem with natural geometric condition on the boundary. Complex Var. Theory Appl. 42, 135–149 (2000)