王康宁. CONTROLLABILITY AND OBSERVABILITY FOR DISTRIBUTED PARAMETER CONTROL SYSTEMS[J]. 数学物理学报(英文版), 1982, 2(4): 403-420.
Wang Kangning. CONTROLLABILITY AND OBSERVABILITY FOR DISTRIBUTED PARAMETER CONTROL SYSTEMS[J]. Acta mathematica scientia,Series B, 1982, 2(4): 403-420.