Kiselev, Arthemy V. Max Planck Institute for Mathematics, Max Planck Society;
https://doi.org/10.1007/s10440-018-0198-6 (Publisher version)
https://arxiv.org/abs/1301.7143 (Preprint)
Kiselev, A. V., & Krutov, A. O. (2019). On the (non)removability of spectral parameters in Z2-graded zero-curvature representations and its applications. Acta Applicandae Mathematicae, 160, 129-167. doi:10.1007/s10440-018-0198-6.