Chapter 43
Notes on Diffy Qs. Differential Equations for Engineers. By by Jiri Lebl, 2013.

43.1 Chapter 7. POWER SERIES METHODS. 7.2.1 Exercises. page 290
43.2 Chapter 7. POWER SERIES METHODS. 7.3.2 The method of Frobenius. Exercises. page 300