Variational Operators, Symplectic Operators, and the Cohomology of Scalar Evolution Equations von Fels, M.E., Yaşar, E.

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Exterior Differential Systems with Symmetry von Anderson, I M, Fels, M E

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Symmetry Reduction of Exterior Differential Systems and Bäcklund Transformations for PDE in the Plane von Anderson, I. M., Fels, M. E.

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Integrating Scalar Ordinary Differential Equations with Symmetry Revisited von Fels, M.E.

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The inverse problem of the calculus of variations for scalar fourth-order ordinary differential equations von Fels, M. E.

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Non-reductive Homogeneous Pseudo-Riemannian Manifolds of Dimension Four von Fels, M. E., Renner, A. G.

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Bäcklund transformations for Darboux integrable differential systems von Anderson, I. M., Fels, M. E.

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The Equivalence Problem for Systems of Second-Order Ordinary Differential Equations von Fels, M. E.

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Symmetry Reduction of Exterior Differential Systems and Baecklund Transformations for PDE in the Plane von Anderson, I M, Fels, ME

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The principle of symmetric criticality in general relativity von Fels, Mark E, Torre, Charles G

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Evaluation of the performance of an information-retrieval system by modified mooers plan von Fels, E. M.

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Group Invariant Solutions Without Transversality von Anderson, Ian M., Fels, Mark E., Torre, Charles G.

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Symmetry Reduction of Exterior Differential Systems and Backlund Transformations for PDE in the Plane von Anderson, I. M, Fels, M. E

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Les arthropodes liés aux galbules et aux graines du genévrier thurifère, Juniperus thurifera L., dans les Atlas marocains von EL ALAOUI EL FELS, M. A, ROQUES, A, BOUMEZZOUGH, A

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Transverse group actions on bundles von Anderson, Ian M., Fels, Mark E.

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Some Relations Between Alternative Rational-Choice Criteria for Consumer-Behavior Theories Based on Weak Orderings von Fels, E M

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Symmetry Reduction of Exterior Differential Systems and Backlund Transformations for PDE in the Plane von Anderson, I M, Fels, M E

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Symmetry Reduction of Variational Bicomplexes and the Principle of Symmetric Criticality von Anderson, Ian M., Fels, Mark E.

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A Co-chain map for the G-invariant de Rham complex von Anderson, I. M, Fels, M. E

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Gesellschaftlich notwendige Arbeit von Fels, E M

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