Natural operations with second order jets Kolář, Ivan, Vosmanská, Gabriela (1987) Proceedings of the 14th Winter School on Abstract Analysis
Natural transformations of affine connections on manifolds to metrics on cotangent bundles Sekizawa, Masami (1987) Proceedings of the 14th Winter School on Abstract Analysis
Nonlinear differential equations from biology Hadeler, K. P. (1982) Nonlinear Analysis, Function Spaces and Applications
Nonlinear potential theory and Sobolev spaces Hedberg, Lars Inge (1986) Nonlinear Analysis, Function Spaces and Applications