For the lazy, the doi is 10.1038/s41586-019-1335-8 if you want to add it to your bibliographies. Obviously, don't use the doi for any illegal purposes, such as getting around the paywall.
For the even lazier, one can just add https://sci-hub.tw/ in front of the nature URL and through the great work of the sci-hub people, get access to a web page that has the paper. It's an amazing UX!