601. http://sn.sai.msu.ru/~sil/preprints/bul_eng.pdf
... Synchronous Evolution of Galaxies in Groups: NGC 524 Group O. K. Sil'chenko and V. L. Afanasiev 245 ISSN 1990-3413, Astrophysical Bulletin, 2012, Vol. ... Four of the five galaxies revealed synchronized bursts of star formation in the nuclei 12 Gyr ago. The only galaxy, in which the ages of stellar population in the nucleus and in the bulge coincide (i.e. the nuclear burst of star formation did not take place) is NGC 502, the farthest from the center of the group of all the galaxies studied. ...