@article{JMAG_2003_10_a4,
     author = {Vasyl Gorkavyy},
     title = {On pseudospherical congruencies in $E^4$},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {498--504},
     publisher = {mathdoc},
     volume = {10},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2003_10_a4/}
}