TY  - JOUR
AU  - Petrov, Philip
AU  - Ninova, Julia
TI  - In memoriam of Prof. Ivan Gantchev Donev
JO  - Mathematics and Education in Mathematics
PY  - 2023
SP  - 101
EP  - 133
VL  - 52
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MEM_2023_52_a9/
LA  - bg
ID  - MEM_2023_52_a9
ER  -