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WikiPedia: Liễu_lùn http://www.mun.ca/biology/delta/arcticf/sal/www/wl... http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl... http://www.eol.org/pages/585064 https://web.archive.org/web/20110605164757/http://... https://web.archive.org/web/20120919142414/http://... https://commons.wikimedia.org/wiki/Salix_herbacea?...