Perhaps you should try some spelling variations:
"la integral formulation" » "la lineal formulacion", "_ integral formulation", "et integral formulation", "la integridad formulation"
"e integral formulation" » "e lineal formulacion"
"de integral formulation" » "de lineal formulacion", "de integrar formulation", "de integrales formulation", "de integraca formulation"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("la integral formulation") OR ("e integral formulation"))) OR ("de integral formulation"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"la integral formulation\") OR (\"e integral formulation\"))) OR (\"de integral formulation\"))*".
• Removing quotes may allow a broader search: (((( la integral formulation ) OR ( e integral formulation ))) OR ( de integral formulation ))*.