An inverse method to compute freeform optical surfaces for generalized zero-étendue sourcesPieter Braam, Jan ten Thije Boonkkamp, Martijn Anthonissen, Koondanibha Mitra, Lisa Kusch and Wilbert IJzermanEPJ Web Conf., 335 (2025) 02004DOI: https://doi.org/10.1051/epjconf/202533502004