Geodesic
The Authomorphism Group of Reed-Solomon Codes
Séminaire lotharingien de combinatoire, 14s (1986) 
Arne Dür. The Authomorphism Group of Reed-Solomon Codes. Séminaire lotharingien de combinatoire, 14s (1986). http://geodesic.mathdoc.fr/item/SLC_1986_14s_a1/
@article{SLC_1986_14s_a1,
     author = {Arne D\"ur},
     title = {The {Authomorphism} {Group} of {Reed-Solomon} {Codes}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1986},
     volume = {14s},
     url = {http://geodesic.mathdoc.fr/item/SLC_1986_14s_a1/}
}
TY  - JOUR
AU  - Arne Dür
TI  - The Authomorphism Group of Reed-Solomon Codes
JO  - Séminaire lotharingien de combinatoire
PY  - 1986
VL  - 14s
UR  - http://geodesic.mathdoc.fr/item/SLC_1986_14s_a1/
ID  - SLC_1986_14s_a1
ER  - 
%0 Journal Article
%A Arne Dür
%T The Authomorphism Group of Reed-Solomon Codes
%J Séminaire lotharingien de combinatoire
%D 1986
%V 14s
%U http://geodesic.mathdoc.fr/item/SLC_1986_14s_a1/
%F SLC_1986_14s_a1

Voir la notice de l'acte provenant de la source Séminaire Lotharingien de Combinatoire website

A class of maximum distance separable codes is introduced which includes Reed-Solomon codes, extended Reed-Solomon codes, and other cyclic or pseudocyclic MDS codes studied recently. Codes in this class are called `Cauchy codes' because of the special form of their generator matrices. For every Cauchy code the automorphism group and its underlying permutation group are determined. For doubly-extended Reed-Solomon codes over GF(q) the permutation group is the semilinear fractional group P\Gamma L(2,q).

The paper has been finally published under the same title in J. Combin. Theory Ser. A 44 (1987), 69-82.