Perhaps you should try some spelling variations:
"la integral formulation" » "la lineal formulacion", "_ integral formulation", "de integral formulation", "la integridad formulation"
"e integral formulation" » "e lineal formulacion"
"et integral formulation" » "et lineal formulacion", "_ integral formulation", "de integral formulation", "e integrales 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 ("et integral formulation"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"la integral formulation\") OR (\"e integral formulation\"))) OR (\"et integral formulation\"))*".
• Removing quotes may allow a broader search: (((( la integral formulation ) OR ( e integral formulation ))) OR ( et integral formulation ))*.