Nikel: Perbezaan antara semakan

* [http://www.npi.gov.au/database/substance-info/profiles/62.html NationalLaman Pollutantweb Inventory''Inventori -Bahan NickelCemar andNasional:'' compoundsHalaman FactFakta SheetNikel dan Sebatian-sebatiannya]

*[http://www.webelements.com/webelements/elements/text/Ni/index.html Laman web ''WebElements.com:'' – NiNikel] (also used as a reference)

*[http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v419/n6903/abs/419132a_fs.html&filetype=&_UserReference=C0A804ED4653F39333F43C407C6F3D7FE5CE ArticleLaman inweb ''Nature:'' onNikel nickeldikeluarkan emittedoleh byduit eurosyiling coinseuro]