Härmälä P, Vuorela H, Hiltunen R, et al. (1992). "Strategy for the isolation and identification of coumarins with calcium antagonistic properties from the roots of Angelica archangelica". Phytochemical Analysis. 3 (1): 42–48. Bibcode:1992PChAn...3...42H. doi:10.1002/pca.2800030108.
Härmälä P, Vuorela H, Hiltunen R, et al. (1992). "Strategy for the isolation and identification of coumarins with calcium antagonistic properties from the roots of Angelica archangelica". Phytochemical Analysis. 3 (1): 42–48. Bibcode:1992PChAn...3...42H. doi:10.1002/pca.2800030108.