@article{JGG_2010_14_1_JGG_2010_14_1_a3,
     author = {D. Papadopoulou and P. Koltsaki },
     title = {Triply {Orthogonal} {Line} {Congruences} with {Common} {Middle} {Surface}},
     journal = {Journal for geometry and graphics},
     pages = {45--58},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {2010},
     url = {http://geodesic.mathdoc.fr/item/JGG_2010_14_1_JGG_2010_14_1_a3/}
}