# AACA, Contents of Vol. 22, Issue 4

Dear Eckhard Hitzer,

 A Gröbner-Bases Algorithm for the Computation of the Cohomology of Lie (Super) Algebras Mansour Aghasi, Benyamin M.-Alizadeh, Joël Merker & Masoud Sabzevari

 On Some Characterizations of Ruled Surface of a Closed Timelike Curve in Dual Lorentzian Space Özcan Bekta? & Süleyman ?enyurt
 The Classical Two-Component Spinor Formalisms for General Relativity I J. G. Cardoso
 The Classical Two-Component Spinor Formalisms for General Relativity II J. G. Cardoso
 Monogenic Appell Sets as Representations of the Heisenberg Algebra David Eelbode
 The Balian-Low Theorem for the Windowed Quaternionic Fourier Transform Yingxiong Fu, Uwe Kähler & Paula Cerejeiras
 On a Quaternionic Analogue of the Cross-Ratio Ewain Gwynne & Matvei Libine
 The Quaternionic Equation ax + xb = c Jacques Helmstetter
 Initial Value Problems in Quaternionic Analysis with a Disturbed Dirac Operator Nguyen Quoc Hung
 Clifford $${\mathcal{A}}$$-algebras of Quadratic $${\mathcal{A}}$$-Modules Patrice P. Ntumba