Classification
539 - Modern physics
54
530 - Physics
23
520 - Astronomy & allied sciences
11
500 - Natural sciences & mathematics
9
621 - Applied physics
6
523 - Specific celestial bodies & phenomena
4
541 - Physical chemistry
4
537 - Electricity & electronics
3
001 - Knowledge
2
300 - Social sciences
2
501 - Philosophy & theory
2
509 - Historical, geographic & persons treatment
2
515 - Analysis
2
620 - Engineering & allied operations
2
003 - Systems
1
370 - Education
1
507 - Education, research & related topics
1
510 - Mathematics
1
514 - Topology
1
518 - Numerical analysis
1
519 - Probabilities & applied mathematics
1
531 - Classical mechanics; solid mechanics
1
543 - Analytical chemistry
1
547 - Organic chemistry
1
616 - Diseases
1