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The case of the Weierstraß Elliptic Function with invariants 
 and 
.
See also Lemniscate Case, Pseudolemniscate Case
References
Abramowitz, M. and Stegun, C. A. (Eds.).  ``Equianharmonic Case ( 
, 
).''  §18.13 in
  Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing.
  New York: Dover, p. 652, 1972.