Geodesic
Groups lying between Steinberg groups over non-perfect fields of characteristics~2 and~3
Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 19 (2013) no. 3, pp. 244-250

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We describe groups lying between Steinberg groups of type $^2A_l$, $^2D_l$, $^2E_6$, or $^3D_4$ over different fields of characteristics 2 and 3 in the case where the larger field is an algebraic extension of the smaller non-perfect field.
Keywords: Chevalley group, Steinberg group, non-perfect field, intermediate subgroups. 
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     author = {Ya. N. Nuzhin},
     title = {Groups lying between {Steinberg} groups over non-perfect fields of characteristics~2 and~3},
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Ya. N. Nuzhin. Groups lying between Steinberg groups over non-perfect fields of characteristics~2 and~3. Trudy Instituta matematiki i mehaniki, Trudy Instituta Matematiki i Mekhaniki UrO RAN, Tome 19 (2013) no. 3, pp. 244-250. http://geodesic.mathdoc.fr/item/TIMM_2013_19_3_a24/