This kind of problem arises in statistics, linear algebra, and regularization.
The method uses quadratic eigen-value problem (QEP).
Version 2 also has Sorensen/Brust method
Bruno Luong (2022). Least-square with 2-norm constraint (https://www.mathworks.com/matlabcentral/fileexchange/27596-least-square-with-2-norm-constraint), MATLAB Central File Exchange. Retrieved .
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