1. Abramowitz, M. and Stegun, I.A. (Eds) (1983) Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables (Ninth reprint with additional corrections of tenth original printing with corrections) (No. 55) Washington, DC; New York: United States Department of Commerce, National Bureau of Standards; Dover Publications.
2. LIII. Explanation of a projection by balance of errors for maps applying to a very large extent of the earth's surface; and comparison of this projection with other projections
3. Beentjes, C. (2015) “Quadrature on a spherical surface [Working paper]” University of Oxford Available at: http://people.maths.ox.ac.uk/beentjes/Essays/QuadratureSphere.pdf (Accessed: 6th March 2019).
4. Small-Scale Map Projection Design