@article{JMAG_2008_4_3_a3,
     author = {O. A. Goncharova},
     title = {Ruled surfaces in $E^4$ with constant ratio of the {Gaussian} curvature and {Gaussian} torsion},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {371--379},
     year = {2008},
     volume = {4},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2008_4_3_a3/}
}