1. Adams, R.A., Fournier, J.J.F.: Sobolev Spaces. Pure and Applied Mathematics (Amsterdam), vol. 140, 2nd edn. Elsevier/Academic Press, Amsterdam (2003)
2. Agmon, S.: Lectures on Exponential Decay of Solutions of Second-Order Elliptic Equations: Bounds on Eigenfunctions of N-body Schrödinger Operators. Mathematical Notes, vol. 29. Princeton University Press, University of Tokyo Press, Princeton, Tokyo (1982)
3. Aronszajn, N., Smith, K.T.: Theory of Bessel potentials. I. Ann. Inst. Fourier (Grenoble) 11, 385–475 (1961)
4. Barab, J.E.: Nonexistence of asymptotically free solutions for a nonlinear Schrödinger equation. J. Math. Phys. 25(11), 3270–3273 (1984)
5. Benney, D.J., Newell, A.C.: The propagation of nonlinear wave envelopes. J. Math. Phys. 46, 133–139 (1967)