La geometría de las películas de jabón: superficies mínimas. Celso José da Costa — 1999 Gaceta de la Real Sociedad Matemática Española
Complete minimal surfaces of arbitrary genus in a slab of ℝ 3 Celso J. Costa; Plinio A. Q. Simöes — 1996 Annales de l'institut Fourier In this paper we construct complete minimal surfaces of arbitrary genus in ℝ 3 with one, two, three and four ends respectively. Furthermore the surfaces lie between two parallel planes of ℝ 3 .