Physics
Journals
de.arXiv.org e-Print archive mirror
Physical Review Letters
Europhysics Letters
JETP Letters
Physical Review A
B
C
D
E
Journal of Physics A-D, G, European Journal of Physics, etc.
New Journal of Physics
ISI Web of Knowledge
Science
Nature
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Elektronische Zeitschriftenbibliothek
Math
Abramowitz and Stegun, Handbook of mathematical functions
Numerical Recipes
The On-Line Encyclopedia of Integer Sequences