"Triatomic Hydrogen". Department of Molecular and Optical Physics, University of Freiburg, Germany. Arquivado dende o orixinal o 30 de xuño de 2012. Consultado o 12 de abril de 2014.
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"Triatomic Hydrogen". Department of Molecular and Optical Physics, University of Freiburg, Germany. Arquivado dende o orixinal o 30 de xuño de 2012. Consultado o 12 de abril de 2014.