Wang L, Wu H-L, Yin X-L, Hu Y, Gu H-W, Yu R-Q.  2017.  Simultaneous determination of umbelliferone and scopoletin in Tibetan medicine Saussurea laniceps and traditional Chinese medicine Radix angelicae pubescentis using excitation-emission matrix fluorescence coupled with second-order calibration method. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy. 170:104-110.