@article{GDZPPN002350254, title = {On a Computation Rule for Polars.}, journal = {Mathematica Scandinavica}, volume = {27}, year = {1970}, pages = {14-16}, zbl = {0189.42603}, url = {http://dml.mathdoc.fr/item/GDZPPN002350254} }
Ng, Kung-Fu. On a Computation Rule for Polars.. Mathematica Scandinavica, Tome 27 (1970) pp. 14-16. http://gdmltest.u-ga.fr/item/GDZPPN002350254/