10. The method of claim 1 , further comprising enabling user selection of said reference sources from a predefined listing of potential reference sources.
10. The method of claim 1 , further comprising enabling user selection of said reference sources from a predefined listing of potential reference sources. 12. The method of claim 10 , wherein which of said search results are provided in said subset is additionally based on which of said reference sources said user declined to use in combination with other documents.