@techreport{
    polla09report,
    author = {P{\"o}ll{\"a}, Matti and Honkela, Timo and Kohonen, Teuvo},
    optmonth = "",
    optnumber = "",
    title = "Bibliography of Self-Organizing Map ({SOM}) Papers: 2002-2005 Addendum",
    address = "Espoo, Finland",
    opttype = "",
    note = "Report TKK-ICS-R23",
    optannote = "",
    optkey = "",
    year = "2009",
    institution = "Helsinki University of Technology, Department of Information and Computer Science"
}