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C. C. Took and D. P. Mandic, “A Quaternion Widely Linear Adaptive Filter,” IEEE Transactions on Signal Processing, Vol. 58, No. 8, 2010, pp. 4427-4431.
http://dx.doi.org/10.1109/TSP.2010.2048323

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.