[See also Differential algebra in the Algebra section.]
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23928 Lev Berkovich: Method of factorization of ordinary differential operators
and some of its applications. Appl. Analysis Discr. Math. 1 (2007), 122-149.

23931 D. Bertrand: Review of the book "Lectures on differential Galois theory"
by Andy Magid. Bull. AMS 33/2 (1996), 289-294.

23929 Alex Kasman: Glimpses of soliton theory. AMS 2010, 300p. Eur 37.

23914 Alex Kasman/Emma Previato: Commutative partial differential operators.
Physica D 152-153 (2001), 66-77.

23968 Peter Kuchment/Sergey Lvin: Identities for sin x that came from
medical imaging. Am. Math. Monthly August-September 2013, 609-621.
Some interesting differential-algebraic identities for trigonometric
end exponential functions.

21072 Glauco Alfredo Lopez Diaz: Symbolic methods for factoring
linear differential operators. Diss. Univ. Linz 2006, 112p.

23932 Andy Magid: Differential Galois theory. Notices AMS October 1999, 1041-1049.

23846 Peter Olver: Differential invariant algebras. Contemp. Math. 549 (2011), 95-121.

23949 Marius van der Put: Galois theory of differential equations, algebraic groups
and Lie algebras. J. Symb. Comp. 28 (1999), 441-473.