PAHIRYA, M. M. Continued-fractions representations of the functions $\mathrm{s}\mathrm{h} z, \mathrm{c}\mathrm{h} z, \mathrm{s}\mathrm{i}\mathrm{n} z, \mathrm{c}\mathrm{o}\mathrm{s} z$. Ukrains’kyi Matematychnyi Zhurnal, v. 70, n. 5, p. 682-698, 25 May 2018.