Ge, Zhaoqiang; Ge, Xiaochi; Zhang, Jifeng Approximate controllability and approximate observability of singular distributed parameter systems. (English) Zbl 07256350 IEEE Trans. Autom. Control 65, No. 5, 2294-2299 (2020). Editorial remark: No review copy delivered. MSC: 93-XX Systems theory; control PDFBibTeX XMLCite \textit{Z. Ge} et al., IEEE Trans. Autom. Control 65, No. 5, 2294--2299 (2020; Zbl 07256350) Full Text: DOI