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Zhenya Yan, “New explicit travelling wave solutions for two new integrable coupled nonlinear evolution equations”, Physics Letters A, 292:1-2 (2001), 100
Mikhail V. Foursov, Peter J. Olver, Enrique G. Reyes, “On formal integrability of evolution equations and local geometry of surfaces”, Differential Geometry and its Applications, 15:2 (2001), 183
Artur Sergyeyev, Noncommutative Structures in Mathematics and Physics, 2001, 379
Alexander B. Borisov, Maxim P. Pavlov, Sergei A. Zykov, “Proliferation scheme for Kaup–Boussinesq system”, Physica D: Nonlinear Phenomena, 152-153 (2001), 104