http://www.researchgate.net/profile/Nikola_Stojanovic6/publication/273341632_Title_Toxic_essential_oils._Part_IV_The_essential_oil_of_Achillea_falcata_L._as_a_source_of_biologicallypharmacologically_active_trans-sabinyl_esters/links/54feede90cf2741b69f1d278.pdf