Rozga, Krzysztof Nonexpanding congruences of null strings in algebraically degenerate right-flat spaces. (English) Zbl 0488.53016 Gen. Relativ. Gravitation 14, 741-756 (1982). MSC: 53B30 53B50 83C99 × Cite Format Result Cite Review PDF Full Text: DOI
Newman, E. T.; Porter, Jack R.; Tod, K. P. Twistor surfaces and right-flat spaces. (English) Zbl 0411.53012 Gen. Relativ. Gravitation 9, 1129-1142 (1978). MSC: 53B30 83C99 × Cite Format Result Cite Review PDF Full Text: DOI