1.3.3 References
- Introductory Course On Diļ¬erential Equations by Daniel A Murray. Longmans
Green and Co. NY. 1924. Chapter IV. Singular solutions
- A Text book for diļ¬erentional equations for postgraduate students by Ray and
Chaturvedi. First edition, 1958. BHASKAR press. INDIA. Chapter V. Singular
solutions
- https://math24.net/singular-solutions-differential-equations.html