Catinella, B. Cosmology, MPI for Astrophysics, Max Planck Society;
Salter, C. J., Ghosh, T., Catinella, B., Lebron, M., Lerner, M. S., Minchin, R., et al. (2008). The Arecibo Arp 220 spectral census - I. Discovery of the pre-biotic molecule methanimine and new cm-wavelength transitions of other molecules. Astronomical Journal, 136(1), 389-399. doi:10.1088/0004-6256/136/1/389.