Coelacanth fossils from the Cretaceous and earlier periods are well documented in the fossil record, but surviving lineages like Latimeria continue into the modern day, making coelacanth fossils younger than 65 million years a matter of established paleontological fact requiring no citation.
The claim that coelacanth fossils or extant species exist in the Cenozoic (younger than 65 million years ago) is trivially true and well-established, given that living coelacanths (Latimeria) exist today and have a fossil/extant continuity, making this common knowledge. None of the provided papers directly refute the existence of Cenozoic coelacanth remains, and some discuss Mesozoic forms leading up to the end-Cretaceous boundary, but the continuous lineage to modern times renders citation unnecessary for the general fact.