Geodesic
Regular unipotent elements from subsystem subgroups of type $C_2$ in representations
Trudy Instituta matematiki, Tome 17 (2009) no. 1, pp. 119-126.

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The regular unipotent elements from subsystem subgroups of type $C_2$ in irreducible modular representations of symplectic groups are studied. For the images of such elements in representations with locally small highest weights all Jordan block sizes were found. 
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A. A. Osinovskaya. Regular unipotent elements from subsystem subgroups of type $C_2$ in representations. Trudy Instituta matematiki, Tome 17 (2009) no. 1, pp. 119-126. http://geodesic.mathdoc.fr/item/TIMB_2009_17_1_a11/

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