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Burch, J.E.; Raddats, M.A.; Thompson, S.G., Reliable Routine Method for the Determination of Plasma Amitriptyline and Nortryptyline by Gas Chromatography, J. Chromatogr., 1979, 162, 3, 351-366, https://doi.org/10.1016/S0378-4347(00)81521-2 . [all data]