2 citations to https://www.mathnet.ru/rus/aa686
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Buser P., “On the mathematical work of Robert Brooks”, Geometry, Spectral Theory, Groups, and Dynamics, Ethonographic Alternatives Book Series, 387, 2005, 1–35
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Croke C.B., “Rigidity theorems in Riemannian geometry”, Geometric Methods in Inverse Problems and Pde Control, IMA Volumes in Mathematics and its Applications, 137, 2004, 47–72