Well--Poised Macdonald Functions W_lambda and Jackson Coefficients   omega_lambda On BC_n
  The very well--poised elliptic Macdonald functions W_lambda in n independent variables are defined and their properties are investigated. The W_lambda are generalized by introducing an extra parameter to the elliptic Jackson coefficients omega_lambda and their properties are studied. BC_n multivariable Jackson sums in terms of both W_lambda and omega_lambda functions are proved. 
Hasan Coskun and Robert A. Gustafson