Mladenov I., On Debye-Huckel's Theory,  Europhys Lett.  24 (1993) 693-698.

Mladenov I. and Tsanov V., Group Representations and Quantization of the Momentum Map. In : Quantization and Coherent States Methods,  S. Twareque Ali et al (Eds), World Scientific, Singapore, 1993 pp 11-16.

Mladenov I. and Tsanov V., Lie Group Representations via Quantization of the Momentum Map,  In : Anales de Fisica, 1, CIEMAT/RSEF, Madrid, 1993 pp 418-421.

Mladenov I., Geometric Quantization of the Five-Dimensional Kepler Problem, Foundations of  Physics  21 (1991) 871-888.

Mladenov I., Geometric Quantization of the Five-Dimensional Kepler Problem,  In: Differential Geometric Methods in Theoretical Physics, Lectures Notes in Physics  375 (1991) 387-389.

Mladenov I., Geometric Quantization via Non-Bijective Canonical Transformations,  In : Selected Topics in QFT and Mathematical Physics, World Scientific, Singapore, 1990 pp 265-271.

Mladenov I., Reductions and Quantization, Int. J. Theor. Phys.  28 (1989) 1255-1267.

Mladenov I., An Extension of the Saxon-Hutner Theorem in the Relativistic Domain,  Phys. Lett. A  137 (1989) 313-318.

Mladenov I., Geometric Quantization of the MIC-Kepler Problem via Extension of the Phase Space, Annales de l'Institute Henri Poincare  50 (1989) 219-227.

Mladenov I., Scattering of Charged Particles off Dyons,  J. Physics A: Math. Gen. 21 (1988) L1-L4

Mladenov I., Generalization of the Saxon-Hutner Theorem in the Relativistic Domain, Phys. Stat. Sol. (b) 145 (1988) k115-119.

Tsanov V. and Mladenov I., Geometric Quantization of the Kepler Problem with Magnetic Charge. In : Group Theoretical Methods in Physics, Lect. Notes in Physics  313 (1988)  pp 275-281.