López Minimal Klein Bottle
The López–Klein bottle is the unique complete minimal Klein bottle in that is once-punctured, one-ended (the boundary has one connected component), and with a total curvature of . It represents the simplest complete minimal immersion and the only complete nonorientable minimal surface in this topology. It is homeomorphic to a Klein bottle with the exception of one point.
 F. J. López, "A Complete Minimal Klein Bottle in ," Duke Mathematical Journal, 71(1), 1993 pp. 23–30. projecteuclid.org/euclid.dmj/1077289835.
 F. J. López. "Website of Francisco J. López." (Sept 23, 2013) www.ugr.es/~fjlopez/Web_FJLopez/English.html.