Martinez, C. A. P., Martinez, A. L. M., Borges Neto, M. F., & Castelani, E. V. (2013). SQUARE OF THE ERROR OCTONIONIC THEOREM AND HYPERCOMPLEX FOURIER SERIES. Trends in Computational and Applied Mathematics, 14(3), 483–495. https://doi.org/10.5540/tema.2013.014.03.0483