Substrate orientation dependence of island nucleation critical thickness in strained heterostructuresS. Sanguinetti, G. Chiantoni, E. Grilli, M. Guzzi, M. Henini, A. Polimeni, A. Patané, L. Eaves and P. C. MainEurophys. Lett., 47 6 (1999) 701-707DOI: https://doi.org/10.1209/epl/i1999-00446-x