“…These points were first noticed by Judd [44] and are known as Judd or Juddian solutions, sometimes also called isolated exact solutions. They have been discussed by a number of authors and can be obtained via different approaches (see, e.g., [44,51,53,83,84,85,86,87]. For example, more recently it was shown that the exceptional points and related constraint polynomials can be obtained from a system of coupled Bethe Ansatz type equations [64].…”