I got a little confused with the terms of annotation files for the human genome. I want to express, that I collected coordinates from the gtf file of ensemble version 91 with the title "Homo_sapiens.GRCh38.91.chr.gtf". This file is based on the Genome Reference Consortium Human Build 38 path 12 (GRCh38.p12). However, I'm not sure, how to correlty cite the file from ensembl, since I don't know if the two files are equal. Do I have to cite GRCh38.p12 or GRCh38.91?