@inproceedings{
    Kangas89a,
    author = {Kangas, Jari and Kohonen, Teuvo and Laaksonen, Jorma and Simula, Olli and Vent{\"{a}}, Olli},
    publisher = "IEEE Service Center",
    title = "Variants of self-organizing maps",
    booktitle = "Proc. IJCNN'89, International Joint Conference on Neural Networks",
    address = "Piscataway, NJ",
    month = "",
    volume = "II",
    year = "1989",
    dbinsdate = "oldtimer",
    pages = "517--522"
}