Chapman, S. J., M. Kavousanakis, I. G. Kevrekidis, and P. G. Kevrekidis. 2021. “Normal Form for the Onset of Collapse: The Prototypical Example of the Nonlinear Schrödinger Equation”. Phys. Rev. E 104. American Physical Society: 044202. Publisher’s Version: Normal form for the onset of collapse: The prototypical example of the nonlinear Schrödinger equation.