Dz. Dokovic et Vp. Platonov, ALGEBRAIC-GROUPS AND LINEAR PRESERVER PROBLEMS, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 317(10), 1993, pp. 925-930
We give a description of all algebraic subgroups of the group GL(n2) w
hich contain PSL (n) in its natural n2-dimensional representation, and
by using this classification we solve a wide variety of so called lin
ear preserver problems.