Redshifted formaldehyde from the gravitational lens B0218+357 N. Jethava, C. Henkel, K. M. Menten, C. L. Carilli and M. J. Reid A&A, 472 2 (2007) 435-442 Published online: 26 June 2007 DOI: 10.1051/0004-6361:20077353