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T. Yazawa; H. Tanaka; K. Eguchi; S. Yokoyama. (1994). Novel alkali-resistant porous glass prepared from a mother glass based on the SiO2-B2O3-RO-ZrO2(R = Mg, Ca, Sr, Ba and Zn) system. , 29(13), 3433–3440. doi:10.1007/bf00352046 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research