The GNU Scientific Library Reference Manual – Third Edition (v1.12)

http://www.network-theory.co.uk/gsl/manual/

This reference manual is the definitive guide to the GNU Scientific Library (GSL), a numerical library for C and C++ programmers. The manual documents over 1,000 mathematical routines needed for solving problems in science and engineering.

http://www.useic.ru/russian_education/structure.htm

Russia has 11-grade system of secondary education. It is compulsory up to 9th form inclusive. Children begin school at age 6 or 7 and study for 4 years to receive primary general education. Then, they study for another 5 years to receive basic secondary education. The Certificate of Incomplete Secondary Education (ATTESTAT) is awarded. After finishing the 9th form graduates of this level may continue their education for another two years at senior high school to receive secondary complete general education. Secondary education leads to the award of the ATTESTAT (a Certificate of Completed General Secondary education.