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Reason for failure:

EJB Exception: ; nested exception is: org.ieee.xplore.exception.SearchDaoException: HTTP Error 404 - Navigation Engine not able to process request 'http://endecaprod.ieee.org:80/graph?node=0&allgroups=1&sort=Publication+Year|desc&offset=0&nbins=25&attrs=Search+All|software+defined+radio+architecture|mode+matchallpartial&dym=1&filter=AND%28OR%28p_Id%3a4197723%29%2cAND%28OR%283406%2c3408%29%2cNOT%284292746436%29%2cNOT%28OR%284293612683%2c+4293292639%29%29%29%29&irversion=640'. Query is openedRefinements=*&arnumber=4197723&sortType=desc_Publication Year&pageNumber=11&searchField=Search All&queryText=software defined radio architecture; nested exception is: org.ieee.xplore.exception.SearchDaoException: HTTP Error 404 - Navigation Engine not able to process request 'http://endecaprod.ieee.org:80/graph?node=0&allgroups=1&sort=Publication+Year|desc&offset=0&nbins=25&attrs=Search+All|software+defined+radio+architecture|mode+matchallpartial&dym=1&filter=AND%28OR%28p_Id%3a4197723%29%2cAND%28OR%283406%2c3408%29%2cNOT%284292746436%29%2cNOT%28OR%284293612683%2c+4293292639%29%29%29%29&irversion=640'. Query is openedRefinements=*&arnumber=4197723&sortType=desc_Publication Year&pageNumber=11&searchField=Search All&queryText=software defined radio architecture