Spectral scaling transformations of nonstationary light Jyrki Laatikainen, Matias Koivurova, Jari Turunen, Tero Setälä and Ari T. Friberg EPJ Web Conf., 266 (2022) 13020 Published online: 13 October 2022 DOI: 10.1051/epjconf/202226613020