@article{10_21136_CMJ_1968_100850,
     author = {Vala, Josef},
     title = {\"Uber die {Regelfl\"achenpaare} mit einer nicht abwickelbaren {Quasifleknodalfl\"ache}},
     journal = {Czechoslovak Mathematical Journal},
     pages = {527--559},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {1968},
     doi = {10.21136/CMJ.1968.100850},
     mrnumber = {0238199},
     zbl = {0162.53203},
     language = {ge},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1968.100850/}
}