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View of the outer surface of ammonium nitrate granules on the side of the shrinkage cavity: (a) GOST No. 2-2013 AN; (b) the same AN after thermal treatment (PorAN); (c) porous AN from China (PAN-MH); (d) porous AN from France (PAN-GP). Reprinted with the permission of Springer Nature from [26], copyright 2016.
