There has been a historical assumption that intersection locations of metamers approximately coincide with particular locations in the wavelength range. However, in the existing research, experimental discussions have been performed under the assumption of specific models for spectral radiance distributions. In this paper, from a theoretical point of view, general analytical results not depending on any specific model are described.
Nobuhito Matsushiro, "Theoretical Analysis of Metamer Intersection Locations" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP25), 2009, pp 331 - 333, https://doi.org/10.2352/ISSN.2169-4451.2009.25.1.art00092_1