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Wang Yung-Li; Herbert B. Callen. (1964). Spin waves in the spin-flop phase of an antiferromagnet, and metastability of the spin-flop transition. , 25(12), 1459–1463. doi:10.1016/0022-3697(64)90062-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research