Salt-Dependent DNA-DNA Spacings in Intact Bacteriophage λ Reflect Relative Importance of DNA Self-Repulsion and Bending Energies, X. Qiu, D. C. Rau, A. V. Parsegian, L. T. Fang, C. M. Knobler and W. M. Gelbart , Physical Review Letters, 01/2011, Volume 106, Number 2, p.28102, (2011) Abstract