%0 Journal Article %A Karsten B.P. %A Viani L. %A Gierschner, Johannes %A Cornil J. %A Janssen R.A.J. %T On the origin of small band gaps in alternating thiophene - thienopyrazine oligomers %D 2009 %U http://hdl.handle.net/20.500.12614/295 %~