@inproceedings{peterconvergence, title={ Convergence analysis of vector extended LOBPCG for computing extreme eigenvalues}, author={Peter Benner, and Xin Liang}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20220424222257833846121}, booktitle={Numer. Lin. Alg. Appl.}, }