<ref xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" id="R2"><label>2</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Grigore</surname><given-names>A</given-names></name><name><surname>Paraschiv</surname><given-names>I</given-names></name><name><surname>Colceru-Mihul</surname><given-names>S</given-names></name><name><surname>Bubueanu</surname><given-names>C</given-names></name><name><surname>Draghici</surname><given-names>E</given-names></name><name><surname>Ichim</surname><given-names>M</given-names></name></person-group><article-title>Chemical composition and antioxidant activity of Thymus vulgaris L. volatile oil obtained by two different methods</article-title><source>Romanian Biotechnological Letters</source><year>2010</year><volume>15</volume><issue>4</issue><fpage>5436</fpage><lpage>5443</lpage></element-citation></ref>