# AACA, Contents of Vol. 23, Issue 3

Dear Eckhard Hitzer,

 In this issue:
 Split Fibonacci Quaternions Mahmut Akyi?it , Hidayet Hüda Kösal & Murat Tosun
 Appell Bases for Monogenic Functions of Three Variables Cynthia Álvarez-Peña & R. Michael Porter
 Hartog’s Type Extension Theorem in Some Piecewise Constant Structure Relations For Metamonogenic Functions of First Order Eusebio Ariza & Antonio Di Teodoro
 Dual Quaternion Involutions and Anti-Involutions Murat Bekar & Yusuf Yay?
 Infinite Dimensional Bicomplex Spectral Decomposition Theorem Kuldeep Singh Charak , Ravinder Kumar & Dominic Rochon
 Real Clifford Algebras as Tensor Products over Centers Yuanfeng Song , Xiankun Du & Wuming Li
 On Eigenvalues of Split Quaternion Matrices Melek Erdo?du & Mustafa Özdemir
 On Complex Split Quaternion Matrices Melek Erdo?du & Mustafa Özdemir
 A Hyperbolic Non Distributive Algebra in 1 + 2 Dimensions Manuel Fernández-Guasti & Felipe Zaldívar
 Real Matrix Representations for the Complex Quaternions Cristina Flaut & Vitalii Shpakivskyi
 On Generalized Fibonacci Quaternions and Fibonacci-Narayana Quaternions Cristina Flaut & Vitalii Shpakivskyi
 On a Solution of the Quaternion Matrix Equation $${A \tilde{X} -X B = C}$$ and Its Applications Tongsong Jiang & Sitao Ling
 Unbounded Normal Operators in Octonion Hilbert Spaces and Their Spectra Sergey V. Ludkowski
 A Two-Parameter Quantum (2+1)-Superspace and its Deformed Derivation Algebra as Hopf Superalgebra Muttalip Özav?ar
 Spinor Bishop Equations of Curves in Euclidean 3-Space Do?an Ünal , ?lim Kisi & Murat Tosun
 Strapdown INS/GPS Integrated Navigation Using Geometric Algebra Dimin Wu & Zhengzhi Wang