Assertion: bifurcation | /r/HasProperty | known for almost 70 years
Facets:
Source sentences:
text: While the first six bifurcations had been known for almost 70 years [Andronov and Leontovich 1937, Andronov et al. 1966], the blue-sky catastrophe (see Figure 1) has been discovered and studied quite recently [Turaev and L. Shilnikov 1995, 1996; Gavrilov and A. Shilnikov 2000; L. Shilnikov et al., 2001, A. Shilnikov et al.