mers ( Lovins , 1968 ; Porter , 1980 ) demonstrably improve retrieval performance .
development of a stemming algorithm
J Lovins
For English , known for its limited number of inflection patterns , lexicon-free general-purpose stem1 ` ' denotes the string concatenation operator . mers ( Lovins , 1968 ; Porter , 1980 ) demonstrably improve retrieval performance . This has been reported for other languages , too , dependent on the generality of the chosen approach ( J Â¨ appinen and Niemist Â¨ o , 1988 ; Choueka , 1990 ; Popovic and Willett , 1992 ; Ekmekc Â¸ ioglu et al. , 1995 ; Hedlund et al. , 2001 ; Pirkola , 2001 ) .
mers ( @@CITATION ; Porter , 1980 ) demonstrably improve retrieval performance .