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@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/} }
Vasyl Gorkavyy. On pseudospherical congruencies in $E^4$. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 10 (2003), pp. 498-504. http://geodesic.mathdoc.fr/item/JMAG_2003_10_a4/