Menéndez Proupin, Eduardo; Beltrán Ríos, Carlos y Wahnón Benarroch, Perla (2015). Nonhydrogenic exciton spectrum in perovskite CH3NH3PbI3. "Physica Status Solidi-Rapid Research Letters", v. 9 (n. 10); pp. 559-563. ISSN 1862-6254. https://doi.org/10.1002/pssr.201510265.