TY - JOUR AU - P. Wachsmuth AU - R. Hambach AU - M. Kinyanjui AU - Matteo Guzzo AU - G. Benner AU - U. Kaiser BT - Phys. Rev. B DA - Aug DO - 10.1103/PhysRevB.88.075433 PB - American Physical Society PY - 2013 EP - 075433 T2 - Phys. Rev. B TI - High-energy collective electronic excitations in free-standing single-layer graphene UR - http://link.aps.org/doi/10.1103/PhysRevB.88.075433 VL - 88 ER -