Inwardly rotating spiral waves in a reaction-diffusion system
                                        Vanag VK, Epstein IR
                                             SCIENCE
                                   294 (5543): 835-837 OCT 26 2001
Abstract:
Almost 30 years have passed since the discovery of concentric (target) and spiral waves in the spatially extended
Belousov-Zhabotinsky (BZ) reaction. Since then, rotating spirals and target waves have been observed in a variety of physical,
chemical, and biological reaction-diffusion systems. AR of these waves propagate out from the spiral center or pacemaker. We
report observations of inwardly rotating spirals found in the BZ system dispersed in water droplets of a water-in-oil
microemulsion. These "antispirals" were also generated in computer simulations.

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