APA (7th ed.) Citation

Haukkanen, P. An identity for a class of arithmetical functions of several variables. Wiley.

Chicago Style (17th ed.) Citation

Haukkanen, Pentti. An Identity for a Class of Arithmetical Functions of Several Variables. Wiley.

MLA (9th ed.) Citation

Haukkanen, Pentti. An Identity for a Class of Arithmetical Functions of Several Variables. Wiley.

Warning: These citations may not always be 100% accurate.