TY  - BOOK
AU  - Sedrakyan, Hayk
AU  - Sedrakyan, Nairi
TI  - The Stair-step approach in mathematics
T2  - Problem books in mathematics
SN  - 9783319706313
U1  - 510  20
PY  - 2018///
CY  - Cham
PB  - Springer-Verlag
KW  - Mathematics
KW  - Problems, exercises, etc
ER  -