@article{44756,
  author = {Nathaniel Ostrom and Keith Knoke and Lars Hedin and Philip Robertson and Alvin JM Smucker},
  title = {Temporal trends in nitrogen isotope values of nitrate leaching from an agricultural soil},
  year = {1998},
  journal = {Chemical Geology},
  volume = {146},
  number = {3},
  pages = {219{\textendash}227},
  url = {http://www.sciencedirect.com/science/article/pii/S0009254198000126},
  language = {eng},
}