TY  - JOUR
AU  - Manko, Stepan
TI  - Quantum-graph vertex couplings: some old and new approximations
JO  - Mathematica Bohemica
PY  - 2014
SP  - 259
EP  - 267
VL  - 139
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/MB.2014.143853/
DO  - 10.21136/MB.2014.143853
LA  - en
ID  - 10_21136_MB_2014_143853
ER  -