-Knuth used B{\'e}zier Cubic Splines to define ``pleasing'' curves in METAFONT, and this approach is still used in modern vector fonts. Since the paths used to render an individual glyph are used far more commonly than general curves, document formats do not require such curves to be specified in situ, but allow for a choice between a number of internal fonts or externally specified fonts. In the case of Knuth's typesetting language \TeX, fonts were intended to be created using METAFONT\cite{knuth}. Figure \ref{zglyph} shows a $\mathscr{Z}$ (Z) in Ralph Smith's Formal Script font as produced by \LaTeX with the start and end points of each Cubic B{\'e}zier identified.
+Knuth used B{\'e}zier Cubic Splines to define ``pleasing'' curves in METAFONT, and this approach is still used in modern vector fonts. Since the paths used to render an individual glyph are used far more commonly than general curves, document formats do not require such curves to be specified in situ, but allow for a choice between a number of internal fonts or externally specified fonts. In the case of Knuth's typesetting language \TeX, fonts were intended to be created using METAFONT\cite{knuth1983metafont}. Figure \ref{zglyph} shows a $\mathscr{Z}$ (script Z) produced by \LaTeX with B{\'e}zier cubics identified.