If you present any data in a publication please cite

The DichroCalc web interface for dichroism calculations
DichroCalc – Circular and Linear Dichroism Online
B.M. Bulheller & J.D. Hirst, Bioinformatics, 25, 539–540 (2009).

Amide ab initio parameter set
Theoretical Studies toward Quantitative Protein Circular Dichroism Calculations
N.A. Besley & J.D. Hirst, J. Am. Chem. Soc., 121, 9636–9644 (1999).

Side Chains
Ab Initio Study of Aromatic Side Chains of Amino Acids in Gas Phase and Solution
D.M. Rogers & J.D. Hirst, J. Phys. Chem. A, 107, 11191–11200 (2003).

Charge-Transfer Transitions
Charge-Transfer Transitions in Protein Circular Dichroism Calculations
M.T. Oakley & J.D. Hirst, J. Am. Chem. Soc, 128, 12414–12415 (2006).

Naphthalenediimide
Electronic Structure and Circular Dichroism Spectroscopy of Naphthalenediimide Nanotubes
B.M. Bulheller, G.D. Pantoş, J.K.M. Sanders & J.D. Hirst, Phys. Chem. Chem. Phys., 11, 6060–6065 (2009).

Oligoureas
Calculations on the Electronic Excited States of Ureas and Oligoureas
M.T. Oakley, G. Guichard, J.D. Hirst, J. Phys. Chem. B, 111, 3274–3279 (2007).