@article{SungKimFimmeletal.2015,
  author    = {Jooyoung Sung and Pyosang Kim and Benjamin Fimmel and Frank W{\"u}rthner and Dongho Kim},
  title     = {Direct observation of ultrafast coherent exciton dynamics in helical π-stacks of self-assembled perylene bisimides},
  journal   = {Nature Communications},
  volume    = {6},
  number    = {8646},
  doi       = {10.1038/ncomms9646},
  year      = {2015},
}