@TECHREPORT {HSl05,
     AUTHOR = {{Hochstenbach}, Michiel and Sleijpen, Gerard L. G. 
               },
      TITLE = {Harmonic and refined {R}ayleigh--{R}itz for the polynomial
      eigenvalue problem},
       TYPE = {Preprint},
     NUMBER = {},
INSTITUTION = {Dep. Math., University Utrecht},
    ADDRESS = {Utrecht, the Netherlands},
      MONTH = {June},
       YEAR = {2005},
        NOTE ={Submitted}}

@ARTICLE {HSl08,
   AUTHOR = {{Hochstenbach}, Michiel and Sleijpen, Gerard L. G.},
    TITLE = {Harmonic and refined {R}ayleigh--{R}itz for the 
             polynomial eigenvalue problem},
  JOURNAL = {Numer. Linear Algebra Appl.},
 FJOURNAL = {Numerical Linear Algebra with Applications},
   VOLUME = {15},
     YEAR = {2008},
    PAGES = {35-54},}