Synthesis of Some Bridged Heterocyclic Systems by Condensation of Diamines with 4,6-Dimethylbicyclo[3.3.1]nona-3,6-diene-2,8-dione - Mellor, John M; Nott, Andrew P; Pathirana, Ranjith N; Stibbard, John H A (Synthesis, 1982)