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- Accelerated DF-SANE https://arxiv.org/pdf/2104.13447.pdf
- DF-SAUNE for Under-determined LS Problems https://www.scielo.br/j/cam/a/6nML5bXvthQ7nKRpFSjqyjH/?lang=en
#345 sets up spectral methods in a nicer way but it would be nice to have these extensions.