To cite iCn3D, please reference:

Wang J, Youkharibache P, Zhang D, Lanczycki CJ, Geer RC, Madej T, Phan L, Ward M, Lu S, Marchler GH, Wang Y, Bryant SH, Geer LY, Marchler-Bauer A. iCn3D, a Web-based 3D Viewer for Sharing 1D/2D/3D Representations of Biomolecular Structures. Bioinformatics. 2020 Jan 1;36(1):131-135. (Epub 2019 June 20.) doi: 10.1093/bioinformatics/btz502. [PubMed PMID: 31218344] [Full Text at Oxford Academic]

A separate page lists all publications about NCBI's 3D Macromolecular Structures Resources, including articles by the NCBI Structure group describing the results of computational biology research on the Molecular Modeling Database, such as 3D structure comparisons, and more.