2 citations to https://www.mathnet.ru/rus/ivm9410

1. W. B. Lopes, C. G. Lopes, “Geometric-algebra adaptive filters”, IEEE Trans. Signal Process., 67:14 (2019), 3649–3662          
2. P. C. Leopardi, “Gastineau-hills' quasi-Clifford algebras and plug-in constructions for Hadamard matrices”, Adv. Appl. Clifford Algebr., 29:3 (2019), UNSP 48