Preparations of colloidal silica
<a href="//commons.wikimedia.org/wiki/User:Kopiersperre" title="User:Kopiersperre">Kopiersperre</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Kopiersperre" title="User talk:Kopiersperre"><span class="signature-talk">talk</span></a>)
<span class="int-own-work" lang="en">Own work</span>, after <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.4236%2Feng.2010.212126">10.4236/eng.2010.212126</a>