Bronshtein and Semendyayev

Bronshtein and Semendyayev (often just Bronshtein or Bronstein, sometimes BS) (Or Handbook Of Mathematics) is the informal name of a comprehensive handbook of fundamental working knowledge of mathematics and table of formulas originally compiled by the Russian mathematician Ilya Nikolaevich Bronshtein and engineer Konstantin Semendyayev. The work was first published in 1945 in Russia and soon became a "standard" and frequently used guide for scientists, engineers, and technical university students.

Source: Wikipedia — Bronshtein and Semendyayev (CC BY-SA 4.0)