1. Waste flow allocation planning through a grey fuzzy quadratic programming approach

Huang, G.H., 1994

Civil Engineering Systems

http://www.google.com.hk/webhp?client=aff-1616dh&channel=footer&newwindow=1#hl=zh-CN&newwindow=1&safe=strict&client=aff-1616dh&hs=kBF&channel=footer&source=hp&q=Waste+flow+allocation+planning+through+a+grey+fuzzy+quadratic+programming+approach&oq=Waste+flow+allocation+planning+through+a+grey+fuzzy+quadratic+programming+approach&aq=f&aqi=&aql=undefined&gs_sm=s&gs_upl=17000646l17009501l0l8l8l1l0l0l2l223l850l1.2.2l5&fp=e56dcd9930f9b5bc&biw=1236&bih=875

2. Grey quadratic programming and its application to municipal waste management planning under uncertainty

Huang, G.H., 1995

Engineering Optimization

http://tandfprod.literatumonline.com/doi/abs/10.1080/03052159508941354