L. Colina; M. L. Garcia Vargas; J. M. Mas-Hesse; A. Alberdi; m.fl. (1997). «Nuclear Star-forming Structures and the Starburst–Active Galactic Nucleus Connection in Barred Spirals NGC 3351 and NGC 4303». Astrophysical Journal Letters. 484 (1): L41–L45. Bibcode:1997ApJ...484L..41C. doi:10.1086/310766.
L. Colina; M. L. Garcia Vargas; J. M. Mas-Hesse; A. Alberdi; m.fl. (1997). «Nuclear Star-forming Structures and the Starburst–Active Galactic Nucleus Connection in Barred Spirals NGC 3351 and NGC 4303». Astrophysical Journal Letters. 484 (1): L41–L45. Bibcode:1997ApJ...484L..41C. doi:10.1086/310766.