@article{IJAMCS_2012_22_1_a2,
     author = {Yang, F. and Shah, S. L. and Xiao, D.},
     title = {Signed directed graph based modeling and its validation from process knowledge and process data},
     journal = {International Journal of Applied Mathematics and Computer Science},
     pages = {41--53},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IJAMCS_2012_22_1_a2/}
}