This definition appears somewhat frequently
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Samples in periodicals archive:
Static and dynamics aspects of perturbed angular correlation measurement in Perovskite crystals Y. Yeshurun, S. Havlin, Y. Schlesinger Solid State Comm.
The anomalous heat effect on D/H loaded Palladium: Exploration at an atomic level, preliminary perturbed angular correlations studies by Juliana Schell, Vittorio Violante, Graham K. Hubler and Collaborators: Moustapha Thioye, Jinghao He, João G. M. Correia, Iberê R. S. Junior, Izabela T.