How to Find an Interstellar Comet: A Q&A with Discoverer Gennady Borisov
https://www.space.com/interstellar-comet-borisov-discoverer-interview-gennady-borisov.html
The Trans-Neptunian Solar System (Chapters 15 and 16)
https://www.sciencedirect.com/book/9780128164907/the-trans-neptunian-solar-system
Stellar engines: Design considerations for maximizing acceleration
https://www.sciencedirect.com/science/article/abs/pii/S0094576519312457
XO-7 b: A transiting hot Jupiter with a massive companion on a wide orbit
https://arxiv.org/abs/1912.02821
Habitable Age Instead of Location for Terrestrial Worlds
https://arxiv.org/abs/1912.02862