29. Impurity scattering of spin waves in a doped Mott-Hubbard antiferromagnet
P. Sen and A. Singh
Phys. Rev. B  53, 328-334 (1996).

30. Self-consistent study of the impurity-doped Mott-Hubbard insulator
S. Basu and A. Singh
Phys. Rev. B  53, 6406-6411 (1996).

31. Two-magnon Raman scattering in a Mott-Hubbard antiferromagnet
S. Basu and A. Singh
Phys. Rev. B 54, 6356-6363 (1996).

32. Hopping disorder, magnon-energy renormalization,
and two-magnon Raman scattering in an antiferromagnet
S. Basu and A. Singh
Phys. Rev. B  55, 12338-12342 (1997).

33. Self-consistent study of pure and doped three-band Hubbard model
P. Sen and A. Singh
Pramana,  49, 505 (1997).

Collective modes in a generalized Hubbard model
A. K. Gupta, I. Paul and A. Singh
IITK preprint (1997).

Robustness of defect states in antiferromagnets and semiconductors
A. Singh, V. A. Singh and P. Sen
IITK preprint (1997).

Magnetic impurities in antiferromagnets and superconductors
A. Singh and P. Sen
IITK preprint (1997).

34. Magnetic impurities in Mott-Hubbard antiferromagnets
A. Singh and P. Sen
Phys. Rev. B  57, 10598 (1998).
Report No. cond-mat/9802052

Quantum antiferromagnetism in the d=3 Hubbard model --- a spin-fluctuation approach
A. Singh
Report No. cond-mat/9802047.

35. Disorder-enhanced delocalization and local-moment quenching in a disordered antiferromagnet
A. Singh, M. Ulmke, and D. Vollhardt
Phys. Rev. B  58, 8683-8693, (1998)
Report No. cond-mat/9803094.

36. Disorder and Impurities in Hubbard antiferromagnets
M. Ulmke, P. J. H. Denteneer, V. Janis, R. T. Scalettar, A. Singh, D. Vollhardt, and G. T. Zimanyi
Advances in Solid State Physics  vol. 38 (Vieweg, Wiesbaden, 1999), page 369
Report No. cond-mat/9804188.

37. On evaluation of transverse spin fluctuations in quantum magnets
A. Singh
Euro. Phys. Jour. B  11, 5-11 (1999)
Report No. cond-mat/9802049.

Equation of motion approach for the Hubbard model:
improved decoupling scheme, charge fluctuations, and the metal-insulator transition
A. Singh
Report No. cond-mat/0001413.

Breakdown of the Onsager reaction-field theory in two dimensions
A. Singh
Report No. cond-mat/0003040

Spectral function of transverse spin fluctuations in an antiferromagnet
A. Singh
Report No. cond-mat/ 0006079