Comparative study of non-invasive force and stress inference methods in tissue S. Ishihara, K. Sugimura, S. J. Cox, I. Bonnet, Y. Bellaïche and F. Graner Eur. Phys. J. E, 36 4 (2013) 45 Published online: 26 April 2013 DOI: 10.1140/epje/i2013-13045-8