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P. Šebo; Š. Kavecká; P. Štefánik; G. Korb. (2000). Influence of Ti and Zr on the bond strength between carbon rod and Cu-Ti and/or Cu-Zr alloys. , 35(2), 503–507. doi:10.1023/a:1004792022731 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research