The article related to the sampling campaigns around Mt. Ontake reported under Expeditions/Fieldwork has been published in Scientific Reports. Here the full citation:

Sano, Y., Kagoshima, T., Takahata, N., Nishio, Y., Roulleau, E., Pinti, D. L., Fischer, T. P. (2015). Ten-year helium anomaly prior to the 2014 Mt Ontake eruption. Scientific Reports, 5, doi:10.1038/srep13069.