N. Schmitt, M. Kilian, S. Kobayashi, and W. Rossman, Unitarization of monodromy representations and constant mean curvature trinoids in 3-dimensional space forms, J. Lond. Math. Soc. (2)75(2007), no. 3, 563—581 [2352721].
N. Schmitt, Constant mean curvature n-noids with platonic symmetries, arxiv:math/0702469(2007)link.