@article {NewmanRBS93, title = {Real-space renormalization-group for the random-field {I}sing-model}, journal = {Physical Review B}, volume = {48}, year = {1993}, pages = {16533-16538}, author = {Newman, M. E. J. and Roberts, B. W. and Barkema, G. T. and Sethna, J. P.} }