@article{TM_2004_247_a19,
     author = {D. W. Henderson},
     title = {Extended {Hyperbolic} {Surfaces} in~$R^3$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {267--279},
     publisher = {mathdoc},
     volume = {247},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_2004_247_a19/}
}