Geodesic
On pseudospherical congruencies in $E^4$
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 10 (2003) no. 4, pp. 498-504 
Vasyl Gorkavyy. On pseudospherical congruencies in $E^4$. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 10 (2003) no. 4, pp. 498-504. http://geodesic.mathdoc.fr/item/JMAG_2003_10_4_a4/
@article{JMAG_2003_10_4_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},
     year = {2003},
     volume = {10},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2003_10_4_a4/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Geometric Bäcklund transformations of pseudospherical surfaces in four-dimensional Euclidean space are studied. An analog of the classical theorems by Bäcklund, Tenenblat and Terng is proved.