TY - JOUR T1 - Ring currents in the porphyrins: pi shielding, delocalisation pathways and the central cation JO - ORG BIOMOL CHEM PY - 2005/11/21 AU - Steiner E AU - Soncini A AU - Fowler PW ED - DO - DOI: 10.1039/b511913h VL - 3 IS - 22 SP - 4053 EP - 4059 Y2 - 2025/06/30 ER -