@article{GDZPPN002421739,
title = {Normal Characteristic Forms: Conformal Invariance and Duality.},
journal = {Mathematische Zeitschrift},
volume = {162},
year = {1978},
pages = {125-142},
zbl = {0378.53031},
url = {http://dml.mathdoc.fr/item/GDZPPN002421739}
}
Moore, John Douglas; White, James H. Normal Characteristic Forms: Conformal Invariance and Duality.. Mathematische Zeitschrift, Tome 162 (1978) pp. 125-142. http://gdmltest.u-ga.fr/item/GDZPPN002421739/