https://arxiv.org/abs/2006.11938
http://arxiv.org/abs/2006.10735
https://arxiv.org/abs/2006.12447 and https://arxiv.org/abs/2006.11264
https://arxiv.org/abs/2006.10035
https://arxiv.org/abs/2006.14521
https://arxiv.org/abs/2006.11243