Baksa, V., Bandura, A.I. and Salo, T. 2022. Boundedness of the L-index in a direction of the sum and product of slice holomorphic functions in the unit ball. Matematychni Studii. 57, 2 (Jun. 2022), 216-224. DOI:https://doi.org/10.30970/ms.57.2.216-224.