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doi.org
Emch, Arnold (1916), On some properties of the medians of closed continuous curves formed by analytic arcs, American Journal of Mathematics, 38 (1): 6—18, doi:10.2307/2370541, MR1506274
Stromquist, Walter (1989), Inscribed squares and square-like quadrilaterals in closed curves, Mathematika, 36 (2): 187—197, doi:10.1112/S0025579300013061, MR1045781
Нільсен, Mark J.; Wright, S. E. (1995), Rectangles inscribed in symmetric continua, Geometriae Dedicata, 56 (3): 285—297, doi:10.1007/BF01263570, MR1340790