@article{FORUM_1991__3_2_186402,
     author = {Donato Pertici},
     title = {Trace {Theorems} for {Regular} {Functions} of {Several} {Quaternion.}},
     journal = {Forum mathematicum},
     pages = {461--478},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {1991},
     zbl = {0737.30030},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1991__3_2_186402/}
}