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  2. Michael F. Singer, Testing reducibility of linear differential operators: A group-theoretic perspective, Appl. Algebra Engrg. Comm. Comput. 7 (1996), no. 2, 77–104.[MR]
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  5. Michael F. Singer and Felix Ulmer, On a third order differential equation whose differential Galois group is the simple group of 168 elements, Applied algebra, algebraic algorithms and error-correcting codes (San Juan, PR, 1993), Lecture Notes in Comput. Sci., vol. 673, Springer, Berlin, 1993, pp. 316–324.[MR]
  6. Michael F. Singer and Felix Ulmer, Necessary conditions for Liouvillian solutions of (third order) linear differential equations, Appl. Algebra Engrg. Comm. Comput. 6 (1995), no. 1, 1–22.[MR]