Original: Investigacion agraria: Sistemas y recursos forestales 13(1): 161-177 (2004) However, some of these trees, notably those with the Siberian Elm U. pumila in their ancestry, will probably have a comparatively small mature size and lack the forms for which the iconic American Elm and English Elm were prized.
Simplified: Investigacion agraria: Sistemas y recursos forestales 13(1): 161-177 (2004).