Links: https://www.sciencedirect.com/science/article/pii/S1110016817302089 https://link.springer.com/chapter/10.1007/978-3-319-02297-0_9 https://arxiv.org/abs/1909.09112 https://arxiv.org/abs/0809.3306 and etc.
Links:
https://www.sciencedirect.com/science/article/pii/S1110016817302089
https://link.springer.com/chapter/10.1007/978-3-319-02297-0_9
https://arxiv.org/abs/1909.09112
https://arxiv.org/abs/0809.3306
and etc.