On congruent second grades and some areas of concern

[1] CAPORALI, 1878, ACC LINCEI, P749

[2] CREMONA, 1875, ACAD LINCEI, P285

[3] JESSOP A, 1903, TREATISE LINE COMPLE

[4] Introduction to the theory of third class elementary curves [J]. MATHEMATISCHE ANNALEN, 1915, 76 : 548 - 574

[5] KUMMER, 1866, BERLINER ABH, P1

[6] REYE T, 1879, PROJEKTIVGEOMETRISCH, P84

[7] SCHUR F, 1879, MATH ANN, P432

[8] SIEHE, LINIENGEOMETRI, V2, P146

[9] SIEHE, 1914, DET KGL DANSKE VIDEN

[10] STURM R, 1892, LINIENGEOMETRIE SYNT, V1

[1] CAPORALI, 1878, ACC LINCEI, P749

[2] CREMONA, 1875, ACAD LINCEI, P285

[3] JESSOP A, 1903, TREATISE LINE COMPLE

[4] Introduction to the theory of third class elementary curves [J]. MATHEMATISCHE ANNALEN, 1915, 76 : 548 - 574

[5] KUMMER, 1866, BERLINER ABH, P1

[6] REYE T, 1879, PROJEKTIVGEOMETRISCH, P84

[7] SCHUR F, 1879, MATH ANN, P432

[8] SIEHE, LINIENGEOMETRI, V2, P146

[9] SIEHE, 1914, DET KGL DANSKE VIDEN

[10] STURM R, 1892, LINIENGEOMETRIE SYNT, V1