APA (7th ed.) Citation

Gutierrez Vidalón, C. T., & Sotomayor Tello, J. (1991). Lines of curvature and umbilical points on surfaces. IMPA.

Chicago Style (17th ed.) Citation

Gutierrez Vidalón, Carlos Teobaldo, and Jorge Sotomayor Tello. Lines of Curvature and Umbilical Points on Surfaces. Río de Janeiro: IMPA, 1991.

MLA (9th ed.) Citation

Gutierrez Vidalón, Carlos Teobaldo, and Jorge Sotomayor Tello. Lines of Curvature and Umbilical Points on Surfaces. IMPA, 1991.

Warning: These citations may not always be 100% accurate.