Virata, E. T. W-surfaces which have an isometric spherical representation of their lines of curvature. s.n.
Citazione stile Chigago Style (17a edizione)Virata, Enrique Topacio. W-surfaces Which Have an Isometric Spherical Representation of Their Lines of Curvature. [New York: s.n.
Citatione MLA (9a ed.)Virata, Enrique Topacio. W-surfaces Which Have an Isometric Spherical Representation of Their Lines of Curvature. s.n.
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