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

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

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