Francis L. Dougherty Nathaniel P. Ambler Konstantinos P. Triantis A complex adaptive systems approach for productive efficiency analysis: building blocks and associative inferences. 45-63 2017 250 Ann. Oper. Res. 1 https://doi.org/10.1007/s10479-016-2134-3 db/journals/anor/anor250.html#DoughertyAT17