1. Archinard N. (2003). Exceptional sets of hypergeometric series. J. Number Theory 101: 244–269
2. Babister A.W. (1967). Transcendental Functions Satisfying Nonhomogeneous Linear Differential Equations. Macmillan, New York
3. Bailey W.N. (1964). Generalized hypergeometric series. Cambridge Tracts in Mathematics and Mathematical Physics. Stechert-Hafner Inc., New York
4. Baker A. (1990). Transcendental Number Theory, 2nd edn. Cambridge University Press, Cambridge
5. Beukers F. and Wolfart J. (1988). Algebraic Values of Hypergeometric Functions New Advances in Transcendence Theory (Durham, 1986). Cambridge University Press, Cambridge, 68–81