Here's the original paper: https://www.pdf-archive.com/2017/06/20/piis0092867417306347/piis0092867417306347.pdf https://www.pdf-archive.com/2017/06/20/piis00928

Here's the original paper: https://www.pdf-archive.com/2017/06/20/piis0092867417306347/piis0092867417306347.pdf https://www.pdf-archive.com/2017/06/20/piis0092867417306347/...