The M 31 double nucleus probed with OASIS and HST - A natural = 1 mode?R. Bacon, E. Emsellem, F. Combes, Y. Copin, G. Monnet and P. MartinA&A, 371 2 (2001) 409-428DOI: https://doi.org/10.1051/0004-6361:20010317
= 1 mode? = 1 mode?