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Tian, Zhicheng; Chen, Chen; Allcock, Harry R. . (2015). New Mixed-Substituent Fluorophosphazene High Polymers and Small Molecule Cyclophosphazene Models: Synthesis, Characterization, and Structure Property Correlations. Macromolecules, 48(5), 1483–1492. doi:10.1021/acs.macromol.5b00170 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research