C. S. Weckerle, P. O. Staub, and F. P. Schiestl, “Continuum Between Ritual and Medicinal Use of Plants: Smoke Analysis of Ritual Plants from Southwest China: Highlights of Analytical Chemistry in Switzerland”, Chimia, vol. 65, no. 6, p. 438, Jun. 2011, doi: 10.2533/chimia.2011.438.