C.  Bischof-Deichnik, Holtuijzen, J., and Stahl-Biskup, E., ?Multivariate statistical analysis of the essential oil composition of Thymus praecox Opiz ssp polytrichus (Kern. ex Borb,) Ronn. collected in the Tyrolean Alps?, Flavour and Fragrance Journal, vol. 15, no. 1, pp. 1 - 6, 2000.