<ref>{{cite webbook |last1=CostelRizescu |first1=Rizescu|last2=Mihaela|first2=RizescuCostel |title=Structure of Crystalline Solids, Imperfections and Defects in Crystals |date=2018 |publisher=Shutter Waves |___location=Parker, TX |isbn=978-1-947641-17-4 |page=9-15 |pages=77-90 |edition=First |url=https://shutterwaves.com/product/structure-of-crystalline-solids/ |publisheraccessdate=Shutter29 Waves,January 2018 First Edition, pages: 9-15, 77-902020}}</ref>▼
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▲{{cite web|last1=Costel|first1=Rizescu|last2=Mihaela|first2=Rizescu|title=Structure of Crystalline Solids, Imperfections and Defects in Crystals|url=https://shutterwaves.com/product/structure-of-crystalline-solids/|publisher=Shutter Waves, 2018 First Edition, pages: 9-15, 77-90}}