Joosen 

 The formula for G- can be found, e.g., in [4]; 



02(^1,771,^1; ^,77,0 = 



e( ^ j + Oq+i(^i-^)q cos e 







•'e "^M 



y 



q e 



cos {^Ct?!- f)q sin ^} dq 



^■^H /S^q^ cos^e + 2rq cos ^ + ^l" q 



6(^ +Oq+i(fi-^)q cos e . , 



q e cos •[£( 77j - f)q sm y| dq 



/S^q^ cos^0 + 27'q cos 6 \ ^l - q 



e( Sj + Oq-i(f 1-f )q COS 



q e 



cos {eCT^j- f)q sin 0} dq 



with 



/3gq^ cos ^6' - 27q cos + ^l - q 



cos 6* 



(2.18) 



y 47 ' 



li(^i,7]j,Ci; ^,77, O = [g2(^i,t7i,Ci; ^,77,0] 



^T=0 



(2.19) 



If the roots in the denominators are denoted by qj, qj, <\^, (\^, the contours Mj 

 and M2 are defined by 



•Ml, 





Qi = Qi 



^9 = Qc 



1 - 27 cos (9 + i 1/47 cos (9-1 

 2^0 cos 2 



1-27 COS B - i. \l ^y cos 6 - \ 



'^ 2^0 cos 25 



1+27 cos 6 - Vl + 47 cos 6 

 2/3o cos 20 



> cos 6 > 



Ay 



1 - 2y cos 6 - v'l - 47 cos 6 

 2/3^ cos 20 



1 - 27 cos + -yT^^~47^~cos~~0 

 -2/3o cos 20 



1+27 cos + a/1 + 47 COS 



2/3„ cos 20 



>. COS < 



47 



172 



