1. Björk, J.E.: Rings of differential operators. North-Holland Mathematical Library, 21, 1979, xvii+374 pp
2. Björk, J.-E.: $${\mathscr {D}}$$-modules and applications. Mathematics and its Applications, 247, 1993. xiv+581 pp
3. Briançon, J., Maisonobe, P., Merle, M.: Constructibilité de l’idéal de Bernstein. Singularities-Sapporo 1998, 79-95, Adv. Stud. Pure Math., 29, Kinokuniya, Tokyo (2000)
4. Briançon, J., Maisonobe, P., Merle, M.: Equations fonctionnelles associées à des fonctions analytiques. Proc. Steklov Inst. Math. 238, 77–87 (2002)
5. Budur, N.: Bernstein-Sato ideals and local systems. Ann. Inst. Fourier 65(2), 549–603 (2015)