@article{FladHarutyunyanSchneideretal.2011,
  author    = {Heinz-J{\"u}rgen Flad and Gohar Harutyunyan and Reinhold Schneider and Bert-Wolfgang Schulze},
  title     = {Explicit Green operators for quantum mechanical Hamiltonians},
  journal   = {Manuscripta mathematica},
  series    = {I. The hydrogen atom},
  volume    = {135},
  number    = {3-4},
  pages     = {497 -- 519},
  doi       = {10.1007/s00229-011-0429-x},
  year      = {2011},
}