TY - JOUR AU - Bickle, Allan TI - Cores and shells of graphs JO - Mathematica Bohemica PY - 2013 SP - 43 EP - 59 VL - 138 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/MB.2013.143229/ DO - 10.21136/MB.2013.143229 LA - en ID - 10_21136_MB_2013_143229 ER -