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The equivalence principle (EP) and Schiff's conjecture are discussed en passant, and the connection between the EP and quantum mechanics is then briefly analyzed. Two semiclassical violations of the classical equivalence principle (CEP) but not of the weak one (WEP), i.e., Greenberger gravitational Bohr atom and the tree-level scattering of different quantum particles by an external weak higher-order gravitational field, are thoroughly investigated afterwards. Next, two quantum examples ofdoi:10.1155/2018/2897419 fatcat:s4ld26clvnd7jmr45j5pm4gbt4