Robuta

https://www.aanda.org/articles/aa/full_html/2019/11/aa35904-19/aa35904-19.html Long-term optical spectroscopic variations in blazar 3C 454.3 | Astronomy & Astrophysics (A&A) blazar 3c 454 3 https://www.aanda.org/articles/aa/ref/2006/14/aahl233/aahl233.html INTEGRAL observations of the blazar 3C 454.3 in outburst | Astronomy & Astrophysics (A&A) blazar 3c 454 3