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Henkelman and H. J¨®nsson, A climbing image nudged elastic band method for finding saddle points and minimum energy paths, J. Chem. Phys. 113, 9901-9904 (2000).

Henkelman and H. J¨®nsson, Improved tangent estimate in the nudged elastic band method for finding minimum energy paths and saddle points, J. Chem. Phys. 113, 9978-9985 (2000).
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