DE-Quadrature (Numerical Automatic Integrator)
This module wraps one of the fortran files in the package provided from the link (included in the bak folder).
https://www.kurims.kyoto-u.ac.jp/~ooura/intde.html
This software is Copyright(C) 1996 Takuya OOURA (email: ooura@mmm.t.u-tokyo.ac.jp)