Mn. Hounkonnou et Gyh. Avossevou, Relativistic scattering theory for finitely many delta-sphere interactionssupported by concentric spheres, J MATH PHYS, 41(4), 2000, pp. 1735-1744
For the model formally expressed as H-{R} = H-D + Sigma(m=1)(N)alpha(m)delt
a(\(x) under bar\ - R-m); (x) under bar is an element of R-3,alpha(m) is an
element of R, R-m> 0, we give a precise mathematical definition, provide b
asic properties and main scattering elements. (C) 2000 American Institute o
f Physics. [S0022-2488(00)00804-5].