Noé, R., HEIDRICH, H., &; HOFFMANN, D. (1988). ENDLESS POLARIZATION CONTROL-SYSTEMS FOR COHERENT OPTICS. JOURNAL OF LIGHTWAVE TECHNOLOGY, 6(7), 1199–1208.https://doi.org/10.1109/50.4117 

Noé, R., HEIDRICH, H., &; HOFFMANN, D. (1988). ENDLESS POLARIZATION CONTROL-SYSTEMS FOR COHERENT OPTICS. JOURNAL OF LIGHTWAVE TECHNOLOGY, 6(7), 1199–1208.https://doi.org/10.1109/50.4117