TY  - BOOK
AU  - Petrakov, B. D.
TI  - ˆThe ‰main principles of variation statistics
PY  - 1969///
CY  - M.
KW  - Москва
KW  - Ме3(к)
KW  - rubbk
KW  - ˆ[‰Р19с21]
ER  -