GEONs API fingerprint project: Selection of analytical techniques for clustering of sildenafil citrate API samples, Deconinck, Eric, Courselle Patricia, Raimondo M., Grange Y., Rebiere H., Mihailova A., Bøyum O., Maurin J.K., Pioru?ska-S?d?ak K., Stengelshøj Olsen L., et al. , Talanta, Jan-03-2022, Volume 239, (2022)