TY - JOUR AU - DalĂ­k, Josef TI - Operators approximating partial derivatives at vertices of triangulations by averaging JO - Mathematica Bohemica PY - 2010 SP - 363 EP - 372 VL - 135 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/MB.2010.140827/ DO - 10.21136/MB.2010.140827 LA - en ID - 10_21136_MB_2010_140827 ER -