@article{VM_2001_3_1_a6,
     author = {Sasho Kalajdzievski},
     title = {Integration by {Parts:} a {Visual} {Proof}},
     journal = {Visual Mathematics},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {2001},
     url = {http://geodesic.mathdoc.fr/item/VM_2001_3_1_a6/}
}