@ARTICLE\{IMM1994-01554,
    author       = "F. Nielson and H. Riis Nielson",
    title        = "The tensor product in Wadler's analysis  of lists",
    year         = "1994",
    pages        = "327-354",
    journal      = "Science of Computer Programming",
    volume       = "22",
    editor       = "",
    number       = "",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1554-full.html"
}