@article{JMAG_2006_2_2_a2,
     author = {Vasyl Gorkavyy},
     title = {On pseudospherical surfaces in $E^4$ with {Grassmann} image of prescribed type},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {138--148},
     year = {2006},
     volume = {2},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2006_2_2_a2/}
}