Shipman, M; Armitage, S; Beale, J; Brawley, SJ; Fayer, SE; Garner, AJ; Leslie, DE; ... Laricchia, G; + view all Shipman, M; Armitage, S; Beale, J; Brawley, SJ; Fayer, SE; Garner, AJ; Leslie, DE; Van Reeth, P; Laricchia, G; - view fewer (2015) Absolute Differential Positronium-Formation Cross Sections. PHYSICAL REVIEW LETTERS , 115 (3) 10.1103/PhysRevLett.115.033401.