European fingerprint study on omeprazole drug substances using a multi analytical approach and chemometrics as a tool for the discrimination of manufacturing sources, Rebiere, H., Grange Y., Deconinck Eric, Courselle Patricia, Acevska J., Brezovska K., Maurin J., Rundlöf T., Portela M.J., Olsen L.S., et al. , Journal of Pharmaceutical and Biomedical Analysis, Jan-01-2022, Volume 208, (2022)