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1. A. E. Asato, RSHL, V. P. Rao & Y. M. Cai, "Azulene-containing Donor-acceptor Compounds as Second-order Nonlinear Chromophores," Tetrahedron Lett., 37, 419-422 (1996).

2. R. S. Muthyala & RSHL, "Synthesis of Fluorinated Azulenes," J. Fluorine Chem., 89, 173-175 (1998).

3. J. R. Bell, R. S. Muthyala, R. W. Larsen, M. Alam & RSHL, "Photoactivities of the Red-Shifted Azulenic Bacterio-rhodopsin Analogues," J. Phys. Chem., 102, 5481-5483 (1998).

4. B. R. Kimball, M. Nakashima, B. S. DeCristofano, F. J. Aranda, D.V. Rao, A. E. Asato & RSHL, "Third Order Nonlinear Optics of Some Azulenic Donor Acceptor Compounds," Proc. SPIE, 3473, 101-111 (1998)

5. N. Tetreault, R. S. Muthyala, RSHL & R. P. Steer, "Control of the Photophysical Properties of Polyatomic Molecules by Substitution and Solvation: The Second Excited Singlet State of Azulene," J. Phys. Chem., 103, 2524-2531 (1999).

6. B. R. Kimball, M. Nakashima, B. S. DeCristofano, A. Panchangam, S. K. Bhadra, D. V. G. L. N. Rao, F. J. Aranda, A. E. Asato & RSHL, "Optical Power Limiting in Some Azulenic Compounds," Proc. SPIE, 3798, 32-37 (1999).

7. P. Wang, P. Zhu, C. Ye, A. E. Asato & RSHL, "Theoretical Investigation and Molecular Design of Some Azulene Derivatives with Large Hyperpolarizabilities," J. Phys. Chem., 103, 7076-7082 (1999).

8. J. N. Woodford, C. H. Wang, A. E. Asato & RSHL, "Hyper-Rayleigh Scattering of Azulenic Donor-Acceptor Molecules at 1064 and 1907 nm," J. Chem. Phys., 111, 4621-4628 (1999).

9. RSHL, R. Muthyala, X.-S. Wang, A. E. Asato, P. Wang & C. Ye, "Correlation of Substituent Effects and Energy Levels of the Two Lowest Excited States of the Azulenic Chromophore," Org. Lett., 2, 269-271 (2000).

10. R. Muthyala, D. Watanabe, A. E. Asato & RSH, "Delocalized Cations in Azulenic Bacteriorhodopsin Analogs and Bacteriorhodopsins. The Question of Resonance versus Equilibrium," Photochem. Photobiol., 74, 837-845 (2001).

11. RSHL, "Colors. Tinkering with the Blue Color of Azulene," J. Chem. Ed., 79, 183-185 (2002).