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M. M. Pahirya, “Continued-fractions representations of the functions $\mathrm{s}\mathrm{h} z, \mathrm{c}\mathrm{h} z, \mathrm{s}\mathrm{i}\mathrm{n} z, \mathrm{c}\mathrm{o}\mathrm{s} z$”, Ukr. Mat. Zhurn., vol. 70, no. 5, pp. 682-698, May 2018.