Perhaps you should try some spelling variations:
"statistics references" » "statistical inferences", "statistical inference"
"statistics inference" » "statistical inference", "statistical inferences", "statistische inferenz"
"states references" » "spaces references", "notes references", "sources references"

Try widening your search to All Fields.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("statistics inference") OR ((("statistics references") OR ("states references")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"statistics inference\") or (((\"statistics references\") OR (\"states references\"))))".
• Removing quotes may allow a broader search: (( statistics inference ) or ((( statistics references ) OR ( states references )))).
• Adding a wildcard symbol may retrieve word variants: (("statistics inference") or ((("statistics references") OR ("states references"))))*.