%0 Journal Article %A Arrondo Esteban, Enrique %T Appendix to "Congruences of small degree in G(1,4)": Pfaffian linkage in codimension three and applications to congruences %D 1998 %@ 0092-7872 %U https://hdl.handle.net/20.500.14352/57177 %X We introduce the notion of Pfaffian linkage in codimension three and give sufficient conditions for the linked variety to be smooth. As a result, we are able to construct smooth congruences of lines in P-4 whose existence was an open problem. %~