Heintz, K E, Björnsson, G, Neeleman, M, Christensen, L B, Fynbo, J P U, Jakobsson, P, Krogager, J-K, Laskar, T, Ledoux, C, Magdis, G, Møller, P, Noterdaeme, P, Schady, P, Ugarte Postigo, A D, Valentino, F M & Watson, D J 2021, ' GRB host galaxies with strong H 2 absorption : CO-dark molecular gas at the peak of cosmic star formation ', Monthly Notices of the Royal Astronomical Society, vol. 507, pp. 1434-1440 . https://doi.org/10.1093/mnras/stab2123