Absolute calibration of the polarisation angle for future CMB B-mode experiments from current and future measurements of the Crab nebulaJ. Aumont, A. Ritacco, J.F. Macías-Pérez, N. Ponthieu and A. MangilliEPJ Web Conf., 228 (2020) 00003DOI: https://doi.org/10.1051/epjconf/202022800003