His most important work on Pfaffian forms was published in 1815 when Pfaff was nearly fifty years old but its importance was not recognised until 1827 when Jacobi published a paper on Pfaff's method.
Ang kanyang mga pinaka-mahalagang trabaho sa Pfaffian forms ay na-publish sa 1815 kapag Pfaff ay halos limampung taong gulang ngunit ang kahalagahan nito ay hindi na kinikilala hanggang sa 1827 kapag Jacobi-publish ng isang papel sa Pfaff ng paraan.