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I.P. Appleyard; R.K. Harris; F.R. Fitch. (1986). 27Al, 31P and 11B MAS n.m.r. studies of BAPO—5, the boron-substituted analogue of the aluminophosphate molecular sieve, AlPO4—5. , 6(6), 428–431. doi:10.1016/0144-2449(86)90024-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research