- Elementary Particles, Quantum Field Theory 92
- Quantum Field Theories, String Theory 91
- Quantum Physics 53
- Classical and Quantum Gravitation, Relativity Theory 52
- Nuclear Physics, Heavy Ions, Hadrons 41
- Astronomy, Astrophysics and Cosmology 39
- Measurement Science and Instrumentation 39
- Nuclear Energy 39
- Environment, general 8
- Environmental Chemistry 8
- Ecotoxicology 7
- Environmental Science and Engineering 7
- Soil Science & Conservation 7
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 7
- Applied and Technical Physics 5
- Atomic, Molecular, Optical and Plasma Physics 5
- Theoretical, Mathematical and Computational Physics 5
- Chemistry/Food Science, general 4
- Complex Systems 4
- Condensed Matter Physics 4