# Reference

- 1
- Geometrical Dimensional Analysis
- Structured physics definitions and formulae map the relationships between concepts, units and fundamental constants. Includes a table of values expressed as common logs.

- 3
- SklogWiki
- Wiki for statistical mechanics and thermodynamics. It is a collaborative electronic encyclopaedia that is instantly up-dateable with the latest research results.

- 5
- Atomic Data for Astrophysics
- Photoionization; Recombination; Collisional ionization and autoionization; Charge transfer; Auger processes Energy levels, wavelengths, transition probabilities; Collision strengths, excitation rates; Stark broadening; Opacities; Fortran subroutines and other Databases for Atomic and Plasma Physics.