Pokhariyal, G. P.; Mishra, R. S. Electromagnetic tensor field. Nijenhuis tensor. (English) Zbl 0234.53014 Tensor, New Ser. 22, 249-254 (1971). MSC: 53A45 78A25 PDFBibTeX XMLCite \textit{G. P. Pokhariyal} and \textit{R. S. Mishra}, Tensor, New Ser. 22, 249--254 (1971; Zbl 0234.53014)
Debney, G. C.; Zund, J. D. A note on the classification of electromagnetic fields. (English) Zbl 0221.53038 Tensor, New Ser. 22, 333-340 (1971). MSC: 53B50 78A25 PDFBibTeX XMLCite \textit{G. C. Debney} and \textit{J. D. Zund}, Tensor, New Ser. 22, 333--340 (1971; Zbl 0221.53038)
Zund, J. D.; Brown, Ezra The theory of bivectors. (English) Zbl 0221.53015 Tensor, New Ser. 22, 179-185 (1971). MSC: 53A30 78A25 PDFBibTeX XMLCite \textit{J. D. Zund} and \textit{E. Brown}, Tensor, New Ser. 22, 179--185 (1971; Zbl 0221.53015)