Perhaps you should try some spelling variations:
"providing discrete-valued functions" » "promising discrete-valued functions" (Expand Search), "providing discrete-value functions" (Expand Search), "providing discrete-valued function" (Expand Search)
"providing discrete-values functions" » "promising discrete-values functions" (Expand Search), "providing discrete-values function" (Expand Search), "providing discrete-value functions" (Expand Search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"providing discrete-valued functions\") OR (\"providing discrete-values functions\"))~".
• Removing quotes may allow a broader search: (( providing discrete-valued functions ) OR ( providing discrete-values functions ))~.
• Adding a wildcard symbol may retrieve word variants: (("providing discrete-valued functions") OR ("providing discrete-values functions"))*.