BibTex format
@article{Pritchard:2013:10.1103/PhysRevD.78.103511,
author = {Pritchard, JR and Loeb, A},
doi = {10.1103/PhysRevD.78.103511},
journal = {Physical Review D: Particles, Fields, Gravitation and Cosmology},
title = {Evolution of the 21cm signal throughout cosmic history},
url = {http://dx.doi.org/10.1103/PhysRevD.78.103511},
volume = {78},
year = {2013}
}