1. Colombeau, J.F.: New Generalized Functions and Multiplication of Distributions. North-Holland, Amsterdam (1984)
2. Colombeau, J.F.: Elementary Introduction to New Generalized Functions. North-Holland, Amsterdam (1985)
3. Djapić, N., Pilipović, S., Scarpalezos, D.: Microlocal analysis of Colombeau’s generalized functions–propagation of singularities. J. Anal. Math. 75, 51-66 (1998)
4. Garetto, C.: Pseudodifferential Operators with Generalized Symbols and Regularity Theory. Ph.D. thesis. Univ. Torino (2004)
5. Garetto, C., Gramchev, T., Oberguggenberger, M.: Pseudodifferential operators with generalized symbols and regularity theory. Electron. J. Differ. Eqn. 116, 1-43 (2005)