A. V. Ivanov. Study of the double mathematical pendulum - I. Numerical investigation of homoclinic transversal intersections // Regul. Chaotic Dyn., 4(1), 104–116, 1999.
A. V. Ivanov. Study of the double mathematical pendulum - II. Investigation of exponentially small transversal intersections // J. Phys. A: Math. Gen., 34 (2001), 11011–11031.
A. V. Ivanov. Study of the double mathematical pendulum - III. Menikov's method applied to the system in the limit of small ratio of pendulums masses // Regul. Chaotic Dyn., 5(3), 329–344, 2000.
