The current implementation is a static version of the algorithm as described in
MANACHER, Glenn K. The Ford-Johnson sorting algorithm is not optimal. Journal of the ACM (JACM), 1979, vol. 26, no 3, p. 441-456.
and
MANACHER, Glenn K. Significant improvements to the Hwang-Lin merging algorithm. Journal of the ACM (JACM), 1979, vol. 26, no 3, p. 434-440.
The current implementation is a static version of the algorithm as described in
and