?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Betcke&rft.aufirst=T&rft.au=Betcke%2C+T&rft.volume=39&rft.date=1+February+2013&rft.atitle=NLEVP%3A+A+Collection+of+Nonlinear+Eigenvalue+Problems&rft.issue=2&rft.title=ACM+TRANSACTIONS+ON+MATHEMATICAL+SOFTWARE&rft.issn=1557-7295&rft.genre=article