Many of the the basic Runge-Kutta formulas can be found in the Handbook of Mathematical Functions,

- Abramowitz & Stegun (eds.), Handbook of Mathematical Functions, Section 25.5.

The implicit Bulirsch-Stoer algorithm `bsimp`

is described in the
following paper,

- G. Bader and P. Deuflhard, "A Semi-Implicit Mid-Point Rule for Stiff Systems of Ordinary Differential Equations.", Numer. Math. 41, 373-398, 1983.

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