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Energy Gaps of α,α‘-Substituted Oligothiophenes from Semiempirical, Ab Initio, and Density Functional Methods
Marcos A. De Oliveira, Hélio A. Duarte, Jean-Michel Pernaut and Wagner B. De Almeida The Journal of Physical Chemistry A 104(35) 8256 (2000) https://doi.org/10.1021/jp001252p