@techreport{iiasa4583,
           month = {February},
            type = {IIASA Working Paper},
           title = {An Evolutionary Model of Long Term Cyclical Variations of Catching Up and Falling Behind},
         address = {IIASA, Laxenburg, Austria},
       publisher = {WP-95-009},
            year = {1995},
             url = {https://pure.iiasa.ac.at/id/eprint/4583/},
          author = {Silverberg, G. and Verspagen, B.}
}