Ratka, A., Kern S., Wittwer, E., Baker LR. Pharmacokinetics of morphine, morphine-3-glucuronide, and morphine-6-glucuronide, in elderly men and women. American Journal of Pain Management. 14 (2004) 45-55.
Baker, LR, and Ratka, A. Pain threshold and tolerance differences in humans due to gender and active morphine metabolites. American Journal of Pain Management. 13 (2003) 16-28.
Baker, LR, and Ratka, A. Sex-specific differences in levels of morphine, morphine-3-glucuronide, and morphine antinociception in rats. Pain. 95 (2002) 65-74.
Baker, LR, Hyrien, O., Ratka, A. Contributions of morphine-3-glucuronide and morphine-6-glucuronide to differences in morphine analgesia in humans. American Journal of Pain Management. 2002
Ulens, C., Baker, LR, Ratka, A., Waumans, D., Tytgat, J. Morphine-6-glucuronide and morphine-3-glucuronide, opioid receptor agonists with different potencies. Biochemical Pharmacology. 62 (2001) 1273-1282.
Baker, LR, Dye, A., Ratka, A. Effects of morphine glucuronides on the function of opiod receptors in human SK-N-SH cells. Neuroscience Letters. 281 (2000) 1-4.