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

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("la integral formulation") OR ("de integral formulation"))) OR ("et integral formulation"))~.
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