Extract key sentences from a text

do you know about an effective method for extracting key sentences from a text with their frequency parameters, etc 开发者_如何学编程and that can also do "stemming" (search also for similar sentences) ?

I wonder also if there is some software implementation

Thanks a lot

Here's a list of Peter Turney's papers about extracting keyphrases from text. Here's a list of Text Summarization Resources.Stemming and Text Similarity are different, large and evolving research areas. You have to give us a much more focused question in order to get a specific answer.

There are many good natural language processing (NLP) toolkits which will do sentence identification and extraction.

See http://en.wikipedia.org/wiki/Natural_language_processing_toolkits for a list.

Your requirement for "similar sentences" needs clarification. Maybe you are looking for a treebank (http://en.wikipedia.org/wiki/Treebank) where sentences are parsed and compared.