@article{MM2_1994__84_1_155973,
     author = {Stylianos S. Stamatakis},
     title = {\"Uber verallgemeinerte {W-Kongruenzen} im projektiven {Raum} {P3,} deren eine {Fokalfl\"ache} entartet.},
     journal = {Manuscripta mathematica},
     pages = {1--12},
     publisher = {mathdoc},
     volume = {84},
     number = {1},
     year = {1994},
     url = {http://geodesic.mathdoc.fr/item/MM2_1994__84_1_155973/}
}