Geodesic
On the restrictions of modular representations of the group $SL_{n+1}(K)$ to subgroups $SL_{r+1}(K)$ with $r$
Trudy Instituta matematiki, Tome 15 (2007) no. 2, pp. 69-77

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Restrictions of irreducible $p$-restricted representations of the algebraic group $SL_{n+1}(K)$ to naturally embedded subgroups $SL_{r+1}(K)$ with $r$ are studied. Let $n>2$ and $\omega=\sum_{i=1}^nm_i\omega_i$ be the highest weight of a representation considered. The composition factors of such restrictions are determined in the case where $r=2$ and $m_i+m_{i+1}+m_{i+2}+2$ for all $i$. For restrictions of arbitrary representations some classes of big composition factors are found as well. 
@article{TIMB_2007_15_2_a7,
     author = {A. A. Osinovskaya},
     title = {On the restrictions of modular representations of the group $SL_{n+1}(K)$ to subgroups $SL_{r+1}(K)$ with $r<n$},
     journal = {Trudy Instituta matematiki},
     pages = {69--77},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMB_2007_15_2_a7/}
}
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A. A. Osinovskaya. On the restrictions of modular representations of the group $SL_{n+1}(K)$ to subgroups $SL_{r+1}(K)$ with $r