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Petrov, Alexey A. (2005).
<i>X</i> (3872), <i>X</i> (3940) as hybrid charmonium states?. Journal of Physics: Conference Series, 9(), 83–86.
doi:10.1088/1742-6596/9/1/013
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research
