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Guide Stars at ESO (PDF). Domenico Bonaccini Calia, Yan Feng, Wolfgang Hackenberg, Ronald Holzlöhner, Luke Taylor, Steffan Lewis. [2021-07-17]. (原始内容 (PDF)存档于2016-03-13)
ISSN 0022-5002. PMC 1285015 . PMID 15693527. doi:10.1901/jeab.2004.82-329. Hackenberg, Timothy D. TOKEN REINFORCEMENT: A REVIEW AND ANALYSIS. Journal of the