1. Degenerate abstract Cauchy problems;Abdelaziz,1991
2. Sobolev Spaces;Adams,1975
3. Integrated solutions to implicit differential equations;Arendt;Rend. Sem. Mat. Univ. Pol. Torino,1993
4. Singular and Degenerate Cauchy Problems;Carroll,1976
5. Existence Families, Functional Calculi and Evolution Equations;deLaubenfels,1994