Cosmology with the submillimetre galaxies magnification bias: Proof of conceptL. Bonavera, J. González-Nuevo, M. M. Cueli, T. Ronconi, M. Migliaccio, L. Dunne, A. Lapi, S. J. Maddox and M. NegrelloA&A, 639 (2020) A128DOI: https://doi.org/10.1051/0004-6361/202038050