@article{KozlovGorboulevKurmanovaetal.1981,
  author    = {J. V. Kozlov and Valentin G. Gorboulev and A. G. Kurmanova and Alexander A. Bayev and A. A. Shilov and V. M. Zhdanov},
  title     = {On the origin of the H1N1 (A/USSR/90/77) influenza virus},
  year      = {1981},
}