@article{BMMS_2010_33_2_a7,
     author = {P. C. Wong and C. K. Tang and H. W. Gan},
     title = {Weak {Potency} of {Fundamental} {Groups} of {Graphs} of {Groups}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2010},
     volume = {33},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2010_33_2_a7/}
}