Wall, TE; Alonso, AM; Cooper, BS; Deller, A; Hogan, SD; Cassidy, DB; (2015) Selective production of Rydberg-stark states of positronium. Physical Review Letters , 114 (17) , Article 173001. 10.1103/PhysRevLett.114.173001 <https://doi.org/10.1103/PhysRevLett.114.173001>. Green open access