Björn, Anders; Björn, Jana; Shanmugalingam, Nageswari (2016). "The Mazurkiewicz distance and sets that are finitely connected at the boundary". Journal of Geometric Analysis. 26 (2): 873–897. arXiv:1311.5122. doi:10.1007/s12220-015-9575-9. S2CID255549682., section 2
Björn, Anders; Björn, Jana; Shanmugalingam, Nageswari (2016). "The Mazurkiewicz distance and sets that are finitely connected at the boundary". Journal of Geometric Analysis. 26 (2): 873–897. arXiv:1311.5122. doi:10.1007/s12220-015-9575-9. S2CID255549682., section 2
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Björn, Anders; Björn, Jana; Shanmugalingam, Nageswari (2016). "The Mazurkiewicz distance and sets that are finitely connected at the boundary". Journal of Geometric Analysis. 26 (2): 873–897. arXiv:1311.5122. doi:10.1007/s12220-015-9575-9. S2CID255549682., section 2