- Helge Holden, Peter Sarnak, The Abel Prize, 2010, 191

- Audrey Terras, Harmonic Analysis on Symmetric Spaces—Higher Rank Spaces, Positive Definite Matrix Space and Generalizations, 2016, 337

- Hermann Flaschka, Alan C. Newell, “Monodromy- and spectrum-preserving deformations I”, Commun.Math. Phys., 76, № 1, 1980, 65

- A. C. Newell, 17, Solitons, 1980, 177
