Studies on the essential oils on the pakistani species of n.o. umbelliferae part i. ligusticum stewartii hiroe e. nasir seed oil Ahmad, M.; Mahmood, S.; Sabir, A.W.; Bhatty, M.K. Pakistan Journal of Scientific and Industrial Research 29(4): 265-267 1986 0030-9885 https://eurekamag.com/research/006/516/006516371.php