@article{KlieglBates2011,
  author    = {Reinhold Kliegl and Douglas Bates},
  title     = {International collaboration in psychology is on the rise},
  journal   = {Scientometrics : an international journal for all quantitative aspects of the science of science, communication in science and science policy},
  volume    = {87},
  number    = {1},
  pages     = {149 -- 158},
  doi       = {10.1007/s11192-010-0299-0},
  year      = {2011},
}