Theoretical computations on the efficiency of acetaldehyde formation on interstellar icy grains Joan Enrique-Romero, Cecilia Ceccarelli, Albert Rimola, Dimitrios Skouteris, Nadia Balucani and Piero Ugliengo A&A, 655 (2021) A9 Published online: 28 October 2021 DOI: 10.1051/0004-6361/202141531