", 1876, page 279*_url=http://springer.metapress.com/content/l332316358227788/fulltext.pdf_format=PDF_accessdate=2007-09-11
", 1876, page 279*_url=http://springer.metapress.com/content/l332316358227788/fulltext.pdf_format=PDF_accessdate=2007-09-11