Citation:
Souto D, Cunha K, arc\'ıa-Hernández D A, Zamora O, Allende Prieto C, Smith V V, Mahadevan S, Blake C, Johnson J A, Jönsson H, et al. Chemical Abundances of M-dwarfs from the APOGEE Survey. I. The Exoplanet Hosting Stars Kepler-138 and Kepler-186. \apj. 2017;835 (2) :239.