{"id":"wittke2013evidence","DOI":"10.1073/pnas.1301760110","URL":"https://doi.org/10.1073/pnas.1301760110","type":"article-journal","title":"Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y ago","author":[{"given":"James H.","family":"Wittke"},{"given":"James C.","family":"Weaver"},{"given":"Ted E.","family":"Bunch"},{"given":"James P.","family":"Kennett"},{"given":"Douglas J.","family":"Kennett"},{"given":"Andrew M. T.","family":"Moore"},{"literal":"and others"}],"issued":{"date-parts":[[2013]]},"year-text":"2013","container-title":"Proceedings of the National Academy of Sciences 110(23)","catalog-key":"SRC0D51WR6Y55NF"}