Steinhaus, Hugo (1954). «Length, shape and area». Colloquium Mathematicum3 (1): 1–13. doi:10.4064/cm-3-1-1-13. «"The left bank of the Vistula, when measured with increased precision would furnish lengths ten, hundred and even thousand times as great as the length read off the school map. A statement nearly adequate to reality would be to call most arcs encountered in nature not rectifiable."».