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R. Jose; Asha M. John; J.K. Thomas; J. James; J. Koshy; R. Divakar; E. Mohandas. (2007). Synthesis, crystal structure, dielectric properties, and potential use of nanocrystalline complex perovskite ceramic oxide Ba2ErZrO5.5. , 42(12), 1976–1985. doi:10.1016/j.materresbull.2007.02.022 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research