We investigate addition relations for multiple sine functions from the view point of formal group laws. We find that the functions which appear in the coefficients are related to classical Eisenstein serires. As application we obtain a limit formula for automorphic forms.
"Formal group laws for multiple sine functions and applications." Kodai Math. J. 36 (1) 109 - 118, March 2013. https://doi.org/10.2996/kmj/1364562723