Arc transitive distance regular covers of cliques

It is consider edge-symmetric distance-regular graph Γ with intersection array { k , ( r − 1 ) μ , 1 ; 1 , μ , k } . Let G = Aut ( Γ ) . Then G acts two-transitively on the set Σ of antipodal classes (fibres) of Γ. This graphs are classified in the next cases: 1) r = 2 or r = k , 2) λ = μ , 3) G contains abelian normal subgroup N regular on Σ (affine case).