%0 Journal Article %A Thomas E. Cecil %T On the completeness of flat surfaces in $S^3$ %J Colloquium Mathematicum %D 1975 %P 139-143 %V 33 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-33-1-139-143/ %R 10.4064/cm-33-1-139-143 %G en %F 10_4064_cm_33_1_139_143