@article{RSMUP_1988__79__185_0,
     author = {Eschenburg, Jost-Hinrich and Tribuzy, Renato de Azevedo},
     title = {Constant mean curvature surfaces in $4$-space forms},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {185--202},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {79},
     year = {1988},
     mrnumber = {964030},
     zbl = {0652.53003},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1988__79__185_0/}
}