TY  - JOUR
AU  - Kolev, Emil
TI  - Preface
JO  - Mathematics and Education in Mathematics
PY  - 2020
SP  - 5
EP  - 6
VL  - 49
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MEM_2020_49_a0/
LA  - bg
ID  - MEM_2020_49_a0
ER  -