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- [7] Concerning differential covariants of the first order of binary cubic differential forms PROCEEDINGS OF THE KONINKLIJKE NEDERLANDSE AKADEMIE VAN WETENSCHAPPEN, 1938, 41 (6/10): : 638 - 642
- [8] Concerning the differential covariants of the first order of the binary cubic differential form. PROCEEDINGS OF THE KONINKLIJKE NEDERLANDSE AKADEMIE VAN WETENSCHAPPEN, 1941, 44 (1/5): : 41 - 46
- [10] Concerning differential covariants of the first order of the binary cubic and binary biquadratic differential form according to R G Molenaar PROCEEDINGS OF THE KONINKLIJKE NEDERLANDSE AKADEMIE VAN WETENSCHAPPEN, 1938, 41 : 278 - 288