@article{JGG_2006_10_1_JGG_2006_10_1_a6,
     author = {K. Malecek and Z. Sibrava },
     title = {Blending {Circular} {Pipes} {With} a {Cyclic} {Surface}},
     journal = {Journal for geometry and graphics},
     pages = {99--107},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2006},
     url = {http://geodesic.mathdoc.fr/item/JGG_2006_10_1_JGG_2006_10_1_a6/}
}