In mathematics, the Burkill integral is an integral introduced by Burkill(1924a, 1924b) for calculating areas. It is a special case of the Kolmogorov integral.
Burkill, J. C. (1924b), "The expression of area as an integral", Proceedings of the London Mathematical Society, 22: 311–336, doi:10.1112/plms/s2-22.1.311