<ref xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" id="R19"><label>19</label><element-citation publication-type="journal"><person-group person-group-type="author"><name><surname>Delgado</surname><given-names>B</given-names></name><name><surname>Fern&#225;ndez</surname><given-names>PS</given-names></name><name><surname>Palop</surname><given-names>A</given-names></name><name><surname>Periago</surname><given-names>PM</given-names></name></person-group><article-title>Effect of thymol and cymene on Bacillus cereus vegetative cells evaluated through the use of frequency distributions</article-title><source>Food Microbiol</source><year>2004</year><volume>21</volume><issue>3</issue><fpage>327</fpage><lpage>334</lpage></element-citation></ref>