@inproceedings{
    nyberg:ec91,
    author = "Nyberg, Kaisa",
    publisher = "Springer-Verlag",
    responsibleauthor = "Nyberg, Kaisa",
    title = "Perfect nonlinear S-boxes",
    url = "http://link.springer.de/link/service/series/0558/bibs/0547/05470378.htm",
    series = "Lecture Notes in Computer Science",
    booktitle = "Advances in Cryptology - {EUROCRYPT'91}",
    volume = "547",
    flags = "copy",
    year = "1991",
    impactfactor = "D3",
    pages = ""
}