Please, cite the following paper in any published work which has made use of RNAfitme:

M. Antczak, T. Zok, M. Osowiecki, M. Popenda, R.W. Adamiak, M. Szachniuk. RNAfitme: a webserver for modeling nucleobase and nucleoside residue conformation in fixed-backbone RNA structures, submitted for publication

The following paper can be also cited:

T. Zok, M. Antczak, M. Riedel, D. Nebel, T. Villmann, P. Lukasiak, J. Blazewicz, M. Szachniuk. Building the library of RNA 3D nucleotide conformations using clustering approach, International Journal of Applied Mathematics and Computer Science 25(3), 2015, 689-700 (doi:10.1515/amcs-2015-0050).