- Boris Konopelchenko, Walter Strampp, “On the structure and properties of the singularity manifold equations of the KP hierarchy”, Journal of Mathematical Physics, 32, № 1, 1991, 40

- N Euler, W-H Steeb, K Cyrus, “Polynomial field theories and nonintegrability”, Phys. Scr., 41, № 3, 1990, 289
