EDIT

package eu.etaxonomy.cdm.model.reference;

import java.io.Serializable;

import java.util.Set;

import java.util.UUID;

	 *     The type of the part for which the possible in-refrence types are to be returned.

	 * @return a set, may be empty, never <code>null</code>

	 */

        if(subReferenceType != null && !subReferenceType.equals(ReferenceType.Generic)){

            if(subReferenceType.isArticle()){

                inRefTypes.add(ReferenceType.Proceedings);

            } else if (subReferenceType == ReferenceType.Section) {

                inRefTypes.add(ReferenceType.Article);

                inRefTypes.add(ReferenceType.Book);

                inRefTypes.add(ReferenceType.Thesis);

                inRefTypes.add(ReferenceType.Patent);

                inRefTypes.add(ReferenceType.Report);

                inRefTypes.add(ReferenceType.WebPage);

                inRefTypes.add(ReferenceType.InProceedings);

            }

        }