Composition of the essential oils of Thymus Jankae chel. VAR. T. Jankae, T. Jankae var. Pantotricus ronn. and T. Jankae var. Patentipilus Lyka from Macedonia, - S. Kulevanova, M. Ristić, T. Stafilov, V. Matevski (My University, 1998)