http://www.chids.de
http://www.ugb.de/e_n_2_148230.html
http://www.sciencegeek.net/Chemistry/chemware/chemware.shtml
http://webbook.nist.gov/chemistry/name-ser.html
http://www.chemcollective.org/vlab/vlab.php
http://www.bunsen.de/Wir+über+uns/Publikationen/Download_+Kohlendioxid+CO2+_+Facetten+eines+Moleküls.html
http://www.nanopartikel.info/cms
http://www.ptable.com
http://www.teachersdomain.org/resource/phy03.sci.phys.matter.zkitchen/?sms_ss=misterwong_de&at_xt=4dbad99d76ecc4ae,0
