Biosignatures Search in Habitable Planets
https://www.mdpi.com/2075-4434/7/4/82
The Search for Planets Around Other Stars: An Introductory Resource Guide for College Instructors
https://www.academia.edu/24164361/The_Search_for_Planets_Around_Other_Stars_An_Introductory_Resource_Guide_for_College_Instructors
Detection of He I 10830 Å~ absorption during the transit of a warm Neptune around the M-dwarf GJ 3470 with the Habitable-zone Planet Finder
https://arxiv.org/abs/1910.02070