1. The problem of integration in finite terms
2. Algorithmic approaches to symbolic integration and simplification
3. R. Risch "On the Integration of Elementary Functions which are Built Up Using Algebraic Operations " SDC report SP-2801 June 1968.]] R. Risch "On the Integration of Elementary Functions which are Built Up Using Algebraic Operations " SDC report SP-2801 June 1968.]]
4. R. Risch "The Solution of the Problem of Integration in Finite Terms " Submitted to Bulletin of the AMS.]] R. Risch "The Solution of the Problem of Integration in Finite Terms " Submitted to Bulletin of the AMS.]]
5. M. Abramowitz and I. A. Stegun eds. "Handbook of Mathematical Functions " Dover 1965.]] M. Abramowitz and I. A. Stegun eds. "Handbook of Mathematical Functions " Dover 1965.]]