How to improve the accuracy of the discrete gradient method in the one-dimensional case - Jan L. Cieslinski; Boguslaw Ratkiewicz (CoRR, 2009)

Energy-preserving numerical schemes of high accuracy for one-dimensional Hamiltonian systems - Jan L. Cieslinski; Boguslaw Ratkiewicz (CoRR, 2010)

Discrete gradient algorithms of high order for one-dimensional systems. - Jan L. Cieslinski; Boguslaw Ratkiewicz (Comput. Phys. Commun., 2012)