http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
international survey of factors of virulence of puccinia striiformis Westend.in 1969,1970 and 1971
Stubbs, R.W. ; Fuchs, Eva. ; Vecht, H. ; Basset, E.J.W.
Institute for Phytopathological Research