Symphytum: diferència entre les revisions
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== Enllaços externs ==
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* [http://vm.cfsan.fda.gov/~dms/dspltr06.html FDA Warning letters on comfrey] {{Webarchive|url=https://web.archive.org/web/20061120061845/http://vm.cfsan.fda.gov/~dms/dspltr06.html |date=2006-11-20
* [http://users.resist.ca/~kirstena/pagecomfrey.html Historical & Current Uses for Comfrey]
* [http://www.bccancer.bc.ca/PPI/UnconventionalTherapies/Comfrey.htm British Columbia Cancer Agency on comfrey] {{Webarchive|url=https://web.archive.org/web/20080416133824/http://www.bccancer.bc.ca/PPI/UnconventionalTherapies/Comfrey.htm |date=2008-04-16
* [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?form=4&db=pubmed&dispmax=100&relentrezdate=No+Limit&term=comfrey PubMed/Medline]
* [http://www.itis.usda.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=32025 ITIS 32025] {{Webarchive|url=https://web.archive.org/web/20060927060038/http://www.itis.usda.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=32025 |date=2006-09-27
* [http://linnaeus.nrm.se/flora/chk/lexs.htm NRM, Sweden] 2002-09-05.
* [http://www.ipni.org/ipni/IpniServlet?whole_name=&family=&infrafamily=&genus=symphytum&infragenus=&is_apni_record=on&species=&infraspecies=&is_gci_record=on&author_abbrev=&publication_title=&is_ik_record=on&include_authors=on&include_basionym_authors=on&query_type=by_query IPNI Symphytum] 2002-09-05.
* [http://hua.huh.harvard.edu/cgi-bin/Flora/taxon.pl?ACT=desc&FLORA_ID=11746&TAXON_ID=132030 Flora de la Xina] {{Webarchive|url=https://web.archive.org/web/20031027091115/http://hua.huh.harvard.edu/cgi-bin/Flora/taxon.pl?ACT=desc&FLORA_ID=11746&TAXON_ID=132030 |date=2003-10-27
{{Bases de dades taxonòmiques}}
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