On the dual variety in characteristic 2
Compositio Mathematica, Tome 75 (1990) no. 2, pp. 129-134. 
@article{CM_1990__75_2_129_0,
     author = {Ballico, Edoardo},
     title = {On the dual variety in characteristic 2},
     journal = {Compositio Mathematica},
     pages = {129--134},
     publisher = {Kluwer Academic Publishers},
     volume = {75},
     number = {2},
     year = {1990},
     mrnumber = {1065202},
     zbl = {0748.14018},
     language = {en},
     url = {http://www.numdam.org/item/CM_1990__75_2_129_0/}
}
TY  - JOUR
AU  - Ballico, Edoardo
TI  - On the dual variety in characteristic 2
JO  - Compositio Mathematica
PY  - 1990
SP  - 129
EP  - 134
VL  - 75
IS  - 2
PB  - Kluwer Academic Publishers
UR  - http://www.numdam.org/item/CM_1990__75_2_129_0/
LA  - en
ID  - CM_1990__75_2_129_0
ER  - 
%0 Journal Article
%A Ballico, Edoardo
%T On the dual variety in characteristic 2
%J Compositio Mathematica
%D 1990
%P 129-134
%V 75
%N 2
%I Kluwer Academic Publishers
%U http://www.numdam.org/item/CM_1990__75_2_129_0/
%G en
%F CM_1990__75_2_129_0
Ballico, Edoardo. On the dual variety in characteristic 2. Compositio Mathematica, Tome 75 (1990) no. 2, pp. 129-134. http://www.numdam.org/item/CM_1990__75_2_129_0/

[1] Barth, W., Moduli of vector bundles on the projective plane, Invent. math. 42(1977), 63-91. | MR | Zbl

[2] Fulton, W., Kleiman, S. and MacPherson, R., About the enumeration of contacts, in Algebraic Geometry - Open Problems, pp. 156-196, Springer Lect, Notes in Math. 997, 1983. | MR | Zbl

[3] Hefez, A. and Kleiman, S., Notes on the duality of projective varieties, in "Geometry Today", pp. 143-183, Progress in Math. 60, Birkhauser, Boston, 1985. | MR | Zbl

[4] Kleiman, S., Tangency and duality, in: "Proc. 1984 Vancouver Conference in Algebraic Geometry", CMS-AMS Conference Proceedings, pp. 163-226, Vol. 6, 1985. | MR | Zbl

[5] Wallace, A., Tangency and duality over arbitrary fields, Proc. London Math. Soc. (3)6(1956), 321-342. | MR | Zbl