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Maeno, Tsutomu, Masakazu Sasaki, Yasushi Shibue, Kazuyuki Mimura, and Hideaki Oka. "Calcium Oxalate in the Sputum May Aid in the Diagnosis of Pulmonary Aspergillosis: A Report of Two Cases." Med Mycol Case Rep 2015.

Maeno, Tsutomu, et al. "Calcium Oxalate in the Sputum May Aid in the Diagnosis of Pulmonary Aspergillosis: A Report of Two Cases." Med Mycol Case Rep 2015.