TY  - JOUR
AU  - Donchev, Tzanko
AU  - Krastanov, Mikhail
AU  - Ribarska, Nadezhda
AU  - Tsachev, Tsvetomir
AU  - Zlateva, Nadia
TI  - Asen L. Dontchev (on the occasion of his 65th birthday) and Vladimir M. Veliov (on the occasion of his 60th birthday)
JO  - Serdica Mathematical Journal
PY  - 2013
VL  - 39
IS  - 3-4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SMJ2_2013_39_3-4_a0/
LA  - en
ID  - SMJ2_2013_39_3-4_a0
ER  -