Effect of lattice relaxation on spin density of nitrogen-vacancy centers in diamond and oscillator strength calculationsM. Babamoradi, M. Heidari Saani, A. Ranjbar, M.A. Vesaghi and Y. KawazoeEur. Phys. J. B, 84 1 (2011) 1-9DOI: https://doi.org/10.1140/epjb/e2011-20370-0