Single stranded loops of quadruplex DNA as key benchmark for testing nucleic acids force fields URL: http://pubs.acs.org/doi/abs/10.1021/ct900200k Authors: Fadrná, Eva / Spacková, Nadia / Sarzyñska, Joanna / Koca, Jaroslav / Orozco, Modesto / Cheatham, / Sponer, Jim