Lutsenko, I. E. Reelle J-selbstadjungierte Differentialoperatoren. (Russian) Zbl 0334.34030 Teor. Funkts., Funkts. Anal. Prilozh. 22, 100-106 (1975). MSC: 34L99 47B25 47E05 PDFBibTeX XMLCite \textit{I. E. Lutsenko}, Teor. Funkts. Funkts. Anal. Prilozh. 22, 100--106 (1975; Zbl 0334.34030)
Lutsenko, I. E. Linear operators that commut with antiunitary operators. (Russian) Zbl 0223.47013 Teor. Funkts., Funkts. Anal. Prilozh. 9, 85-93 (1969). MSC: 47B06 47B15 PDFBibTeX XMLCite \textit{I. E. Lutsenko}, Teor. Funkts. Funkts. Anal. Prilozh. 9, 85--93 (1969; Zbl 0223.47013)