"Dr" . "Paul.crowther@sheffield.ac.uk" . "Crowther Paul" . "paul.crowther@sheffield.ac.uk" . "P.A." . . "Crowther P.A." . "P. A." . "Paul A." . "Crowther" . "Paul" . "Crowther, P. A." . "Crowther, Paul A." . "Paul.Crowther@sheffield.ac.uk" . "Crowther Paul A." . "Paul.Crowther@shef.ac.uk" . "Crowther P. A." . .