1. Alanine enantiomers in the Murchison meteorite
2. High-molecular-weight organic matter in the particles of comet 67P/Churyumov–Gerasimenko
3. Justin Lange, Fabiola Djago, Balkis Eddhif, Quentin Blancart Remaury, Alexander Ruf, Nathalie Karpel Vel Leitner, Louis Le Sergeant d’Hendecourt, Grégoire Danger, Claude Geffroy Rodier, Sébastien Papot, Pauline Poinot, https://chemrxiv.org/articles/preprint/Evidence_for_Proteogenic_Peptide-like_Sequences_in_Meteorites_Through_an_Enzyme-Catalysed_Stereoselective_Hydrolysis_Strategy/11855856
4. M. W. McGeoch, S. Dikler, J. E. M. McGeoch, https://arxiv.org/abs/2002.11688.