- Determination of the polymorphic forms of bicifadine hydrochloride by differential scanning calorimetry-thermogravimetric analysis, X-ray powder diffraction, attenuated total reflectance-infrared spectroscopy, and attenuated total reflectance-near-infrared spectroscopy. McArdle, P., Gilligan, K., Cunningham, D., Ryder, A. Applied spectroscopy. (2005)