Issing؛ Klein، P. .؛ Weiser، M. . (2005). "The homeopathic preparation Vertigoheel versus Ginkgo biloba in the treatment of vertigo in an elderly population: a double-blinded, randomized, controlled clinical trial". Journal of Alternative and Complementary Medicine. ج. 11 ع. 1: 155–160. DOI:10.1089/acm.2005.11.155. PMID:15750375.
nih.gov
pubmed.ncbi.nlm.nih.gov
Issing؛ Klein، P. .؛ Weiser، M. . (2005). "The homeopathic preparation Vertigoheel versus Ginkgo biloba in the treatment of vertigo in an elderly population: a double-blinded, randomized, controlled clinical trial". Journal of Alternative and Complementary Medicine. ج. 11 ع. 1: 155–160. DOI:10.1089/acm.2005.11.155. PMID:15750375.
Kuipers-Upmeijer، J؛ Oosterhuis، HJ (1994). "Unterberger's test not useful in testing of vesitibular function". Nederlands Tijdschrift voor Geneeskunde. ج. 138 ع. 3: 136–9. PMID:8295639.