Parametric representation of univalent functions (wikisearch; web; books)
Parametric resonance, mathematical theory of possibly Mathematical theory of parametric resonance or Mathematical theory of Parametric resonance (wikisearch; web; books)
Partially specified matrices, completion of possibly Completion of partially specified matrices or Completion of Partially specified matrices (wikisearch; web; books)
Poincaré-Fuchs-Klein Automorphic Function possibly Poincaré-Fuchs-Klein automorphic function or Poincaré-fuchs-klein automorphic function (wikisearch; web; books)