APA (7th ed.) Citation

Ferreira, A., & Marques, P. (2013). An efficient long distance echo canceller.

Chicago Style (17th ed.) Citation

Ferreira, Artur, and Paulo Marques. An Efficient Long Distance Echo Canceller. 2013.

MLA (8th ed.) Citation

Ferreira, Artur, and Paulo Marques. An Efficient Long Distance Echo Canceller. 2013.

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