The first of these papers was written while Christoffel was at Zurich, the remaining three papers on the Christoffel- Schwarz formula were written while he was at the Gewerbsakademie in Berlin.
Ang unang mga papeles ng mga ito ay isinulat habang Christoffel ay sa Zurich, ang natitirang tatlong mga papeles sa Christoffel-Schwarz formula ay nakasulat na habang siya ay sa Gewerbsakademie sa Berlin.