Various types of theoretical uncertainties by example of the elastic nucleon-deuteron scattering spin correlation coefficient Cz,xYu. Volkotrub, J. Golak, R. Skibiński, K. Topolnicki and H. WitałaEPJ Web Conf., 199 (2019) 05006DOI: https://doi.org/10.1051/epjconf/201919905006