orld.wolfram.com/RombergIntegration.html"> Romberg Algorithm for integration of real univariate functions. For reference, see
Introduction to Numerical Analysis, ISBN 038795452X, chapter 3.
Romberg integration employs k successive refinements of the trapezoid rule to remove error terms less than order O(N^(-2k)). Simpson's rule is a special case of k = 2.
@since 1.2