Restoring the full velocity field in the gaseous disk of the spiral galaxy NGC 157 A. M. Fridman, O. V. Khoruzhii, V. V. Lyakhovich, O. K. Sil'chenko, A. V. Zasov, V. L. Afanasiev, S. N. Dodonov and J. Boulesteix A&A, 371 2 (2001) 538-559 Published online: 15 May 2001 DOI: 10.1051/0004-6361:20010392