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Cloots, R.; Auguste, Fr.; Rulmont, A.; Vandewalle, N.; Ausloos, M. . (1997). Directional solidification by appropriate chemically active single crystal seed: An alternative way of generating large superconducting 123 single domain. Journal of Materials Research, 12(12), 3199–3202. doi:10.1557/jmr.1997.0416 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research