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JEMMIS, Eluvathingal D.; PATHAK, Biswarup; KING, R. Bruce. Bond length and bond multiplicity: σ-bond prevents short π-bonds. Chem. Commun., 2006, čís. 20, s. 2164–2166. Dostupné online [cit. 2022-08-17]. ISSN1359-7345. DOI: 10.1039/B602116F. (po anglicky)
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JEMMIS, Eluvathingal D.; PATHAK, Biswarup; KING, R. Bruce. Bond length and bond multiplicity: σ-bond prevents short π-bonds. Chem. Commun., 2006, čís. 20, s. 2164–2166. Dostupné online [cit. 2022-08-17]. ISSN1359-7345. DOI: 10.1039/B602116F. (po anglicky)