<ref xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" id="R3"><label>3</label><element-citation publication-type="book"><source>European pharmacopoeia</source><year>2004</year><edition>5 ed.</edition><publisher-loc>Strasbourg: Council of Europe</publisher-loc><publisher-name>E.P.C.</publisher-name><fpage>217</fpage><lpage>218</lpage></element-citation></ref>