equation icon  n n -pe ip(n+1-s)G(n + 1 - s + ie) -i^z n+ie+ -s-ie+ R + = 2 e e G(n-+-1-+-s---ie)-e ^z (^z - ek) sum oo × inf n(2^z)nY(n + n + 1- s + ie,2n + 2n + 2; 2iz^), n n=- oo (153) Rn- = 2ne -pee-ip(n+1+s)ei^z^zn+ie+(^z - ek)-s-ie+ oo sum n(n-+-1-+-s---ie)n- n n × i (n + 1 - s + ie)n fn(2^z) n= - oo × Y(n + n + 1 + s- ie,2n + 2n + 2;- 2iz^).