Bonet, J., Muñoz, J., Huerta, A., Bonet, J., & Peraire, J. (2012). A note on upper bound formulations in limit analysis. International Journal for Numerical Methods in Engineering, 91(8), pp. 896-908. doi:10.1002/nme.4303

Bonet, Javier, J.J Muñoz, A. Huerta, J. Bonet, and J. Peraire. "A Note On Upper Bound Formulations in Limit Analysis." International Journal for Numerical Methods in Engineering 91, no. 8 (2012): 896-908.

Bonet, Javier, et al. "A Note On Upper Bound Formulations in Limit Analysis." International Journal for Numerical Methods in Engineering 91.8 (2012): 896-908.