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Sakamoto, Nobuyuki; Yokoyama, Keita «The Jordan curve theorem and the Schönflies theorem in weak second-order arithmetic». Archive for Mathematical Logic, 46, 5-6, 2007, pàg. 465–480. DOI: 10.1007/s00153-007-0050-6. ISSN: 0933-5846.
Sakamoto, Nobuyuki; Yokoyama, Keita «The Jordan curve theorem and the Schönflies theorem in weak second-order arithmetic». Archive for Mathematical Logic, 46, 5-6, 2007, pàg. 465–480. DOI: 10.1007/s00153-007-0050-6. ISSN: 0933-5846.