PUMA publications for /user/itke/node%20developmentFri May 22 14:24:43 CEST 2020Nagoya JapanConference proceeding of the 9th Asian Pacific Conference on Shell and Spatial Structures (APCS2009)may31Development of node connecting systems used for spatial structures2009development knippers engineering structure 2009 node system connecting itke from:petraheim connection hwang spatial park