Evolution of Dust Abundance and Grain Size Distribution at High Redshift
Hirashita, H. 2012, in: First Stars IV - From Hayashi to the Future - ed. M. Umemura, K. Omukai, AIP Conference Proceedings, Vol. 1480, 119--122

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The Role of Dust in the Early Universe: The Nature of Cosmological Reionization Sources
Yamasawa, D., Habe, A., Omukai, K., Kozasa, T., Nozawa, T., Hirashita, H. 2012, in: First Stars IV - From Hayashi to the Future - ed. M. Umemura, K. Omukai, AIP Conference Proceedings, Vol. 1480, 448--450

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Supernovae as sources of dust in the early universe
Nozawa, T., Kozasa, T., Umeda, H., Maeda, K., Nomoto, K., Tomonaga, N., Yamasawa, D., Habe, A., Hirashita, H. 2012, in: Workshop on multifrequency behaviour of high energy cosmic sources ed. F. Giovannelli, L. Sabau-Graziati, Memorie della Società Astronomica Italiana, Vol. 83, 77--81

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Evolution of grain size distribution traced with gamma ray burst host galaxies
Hirashita, H. 2012, in: GRBs as Probes: From the Progenitor's environment to the High Redshift Universe ed. S. Campana, P. D'Avanzo, A. Melandri, Memorie della Società Astronomica Italiana Supplementi, Vol. 21, 131--134