Crystal structure of <a href="https://en.wikipedia.org/wiki/Boron_Trioxide" class="extiw" title="en:Boron Trioxide">en:Boron Trioxide</a>
<a href="//commons.wikimedia.org/wiki/User:Orci" title="User:Orci">Orci</a>
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Eigenes Werk (own work), created with diamond 3, data source: G.E. Gurr, P.W. Montgomery, C.D. Knutson, B.T.Gorres: The Crystal Structure of Trigonal Diboron Trioxide. In: Acta Cryst., 1970, B26, S. 906-915.