Quantum Correlations of Ideal Bose and Fermi Gases in the Canonical Ensemble by Kazumasa Tsutsui and Takafumi Kita (2016, Journal of the Physical Society of Japan 85, 114603)

This primary paper distinguishes canonical ideal-gas reduced density matrices from the grand-canonical Wick factorization. It studies how particle statistics and ensemble choice affect one- and two-body correlations. Its date is later than the examination; it corroborates the state-assumption distinction rather than documenting what was available to candidates in 2013.