@Article{economics.ja.2009-12,
 author = {Winkler, Ralph},
 title = {Now or Never: Environmental Protection under Hyperbolic Discounting},
 journal = {Economics: The Open-Access, Open-Assessment E-Journal},
 volume = {3},
 year = {2009},
 number = {2009-12},
 doi = {10.5018/economics-ejournal.ja.2009-12}, 
 url = {http://dx.doi.org/10.5018/economics-ejournal.ja.2009-12}
}