(en) E. A. Epps, « UBV photoelectric observations. I. Stars within 25 parasecs of the Sun. II. Stars in quasar, galaxy fields. III. Stars in Kapteyn selected areas. IV. Miscellaneous stars », Royal Observatory Bulletin, vol. 176, , p. 77–115 (Bibcode1972RGOB..176..127E)
(en) B. R. Pettersen, K. Olah et W. H. Sandmann, « Longterm behaviour of starspots. II - A decade of new starspot photometry of BY Draconis and EV Lacertae », Astronomy & Astrophysics Supplement Series, vol. 96, no 3, , p. 497–504 (Bibcode1992A&AS...96..497P)