Perhaps you should try some spelling variations:
"economic systems and ergodic theory" » "economic sectors and ergodic theory"
"dynamic systems and ergodic theory" » "dynamical systems and ergodic theory"
"dynamic system and ergodic theory" » "dynamical system and ergodic theory"

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: (((((("dynamic systems and ergodic theory") OR ("economic systems and ergodic theory"))) OR ("dynamic system and ergodic theory"))) OR ("dynamical systems and ergodic theory")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"dynamic systems and ergodic theory\") OR (\"economic systems and ergodic theory\"))) or (\"dynamic system and ergodic theory\"))) or (\"dynamical systems and ergodic theory\"))".
• Removing quotes may allow a broader search: (((((( dynamic systems and ergodic theory ) OR ( economic systems and ergodic theory ))) or ( dynamic system and ergodic theory ))) or ( dynamical systems and ergodic theory )).
• Adding a wildcard symbol may retrieve word variants: (((((("dynamic systems and ergodic theory") OR ("economic systems and ergodic theory"))) or ("dynamic system and ergodic theory"))) or ("dynamical systems and ergodic theory"))*.