D. P. Mandic and V. S. L. Goh, “Complex Valued Nonlinear Adaptive Filters: Noncircularity, Widely Linear and Neural Models,” John Wiley and Sons Ltd., Hoboken, 2009.
http://dx.doi.org/10.1002/9780470742624

has been cited by the following article:

• TITLE: A Theoretical Foundation for the Widely Linear Processing of Quaternion-Valued Data

  AUTHORS: Tohru Nitta

  KEYWORDS: Augmented Statistics; Complex Number; Estimation; Quaternion

  JOURNAL NAME: Applied Mathematics, Vol.4 No.12, November 20, 2013

  ABSTRACT: In this paper, we will give a theoretical foundation for a quaternion-valued widely linear estimation framework. The estimation error obtained with the quaternion-valued widely linear estimation method is proved to be smaller than that obtained using the usual quaternion-valued linear estimation method.