I think they're looking for a study that was done on this particular item, not just info about isotopes in general There's some more info on the lion's measure

I think they're looking for a study that was done on this particular item, not just info about isotopes in general There's some more info on the lion's measurements here, but I haven't been able to find the study that was presented in September https://journals.iucr.org/j/issues/2024/03/00/in5093/in5093.pdf https://journals.iucr.org/j/issues/2024/03/00/in5093/in5093....