R-matrix realization of two-parameter quantum affine algebra   $U_{r,s}(\widehat{gl}_n)$
  We introduce the two-parameter quantum affine algebra $U_{r,s}(\widehat{gl}_n)$ via the RTT realization. The Drinfeld realization is given and the type A quantum affine algebra is proved to be a special subalgebra of our extended algebra. 
Naihuan Jing, Ming Liu
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