4.1 problem Kovacic 1985 paper. page 13. section 3.2, example 1
4.2 problem Kovacic 1985 paper. page 14. section 3.2, example 2
4.3 problem Kovacic 1985 paper. page 15. Weber equation
4.4 problem Kovacic 1985 paper. page 19. section 4.2. Example 1
4.5 problem Kovacic 1985 paper. page 23. section 5.2. Example 1
4.6 problem Kovacic 1985 paper. page 25. section 5.2. Example 2
4.7 problem Kovacic 2005 paper. Example 2
4.8 problem David Saunders 1981 paper. Example 1
4.9 problem David Saunders 1981 paper. Example 3
4.10 problem Carolyn J. Smith 1984 paper. Appendix B examples and tests. Example 1
4.11 problem Carolyn J. Smith 1984 paper. Appendix B examples and tests. Example 2
4.12 problem Carolyn J. Smith 1984 paper. Appendix B examples and tests. Example 3