Polyphase

Polyphase electric currents and alternate-current motors

by Silvanus P. Thompson.

Modern polyphase machinery

by Andrew Stewart ...

Standard polyphase apparatus and systems

by Maurice A. Oudin.

Polyphase currents

by Alfred Still.

Transmission of power: polyphase system : Tesla patents.

Nikola Tesla

Symmetrical components, as applied to the analysis of unbalanced electrical circuits

by C.F. Wagner and R.D. Evans ; with an introduction by C.L. Fortescue.

Multiphase alternating current transmission ...

H. T. Cory

Polyphased alternating currents.

Édouard Hospitalier

Master equations and tables for symmetrical component fault studies

[by] S. Austen Stigant.

Die einfachen und mehrphasigen elektrischen Wechselströme, beziehungsweise: Der Drehstrom: seine Erzeugung und Anwendung in der Praxis

gemeinfasslich dargestellt von Josef Krämer.