@article{Halava:2006:PSO:1141047.1141049,
    Address = {Amsterdam, The Netherlands, The Netherlands},
    Author = {Halava, Vesa and Harju, Tero and Hirvensalo, Mika},
    File = {Positivity of second order linear recurrent sequences - Halava, Harju, Hirvensalo (0) (0) - a - a - q.pdf},
    ISSN = {0166-218X},
    Journal = {Discrete Appl. Math.},
    Keywords = {recurrent sequeces},
    Month = {March},
    Number = {3},
    Pages = {447--451},
    Publisher = {Elsevier Science Publishers B. V.},
    Title = {Positivity of second order linear recurrent sequences},
    URL = {http://dx.doi.org/10.1016/j.dam.2005.10.009},
    Volume = {154},
    Year = {2006},
    acmid = {1141049},
    bdsk-url-1 = {http://dx.doi.org/10.1016/j.dam.2005.10.009},
    date-added = {2012-09-25 19:34:21 +0200},
    date-modified = {2012-09-25 17:34:34 +0000},
    issue_date = {1 March 2006},
    numpages = {5},
    doi = {10.1016/j.dam.2005.10.009}
}

@article{Halava:2006:PSO:1141047.1141049, Address = {Amsterdam, The Netherlands, The Netherlands}, Author = {Halava, Vesa and Harju, Tero and Hirvensalo, Mika}, File = {Positivity of second order linear recurrent sequences - Halava, Harju, Hirvensalo (0) (0) - a - a - q.pdf}, ISSN = {0166-218X}, Journal = {Discrete Appl. Math.}, Keywords = {recurrent sequeces}, Month = {March}, Number = {3}, Pages = {447--451}, Publisher = {Elsevier Science Publishers B. V.}, Title = {Positivity of second order linear recurrent sequences}, URL = {http://dx.doi.org/10.1016/j.dam.2005.10.009}, Volume = {154}, Year = {2006}, acmid = {1141049}, bdsk-url-1 = {http://dx.doi.org/10.1016/j.dam.2005.10.009}, date-added = {2012-09-25 19:34:21 +0200}, date-modified = {2012-09-25 17:34:34 +0000}, issue_date = {1 March 2006}, numpages = {5}, doi = {10.1016/j.dam.2005.10.009} }