omphalos

n.

浮饰；星；圆锥形石；中心

复数：omphali

Omphalos: An Attempt to Untie the Geological Knot
The Omphalos Context-Free Grammar Learning Competition
The Omphalos Context-Free Grammar Learning Competition
The Omphalos Context-Free Grammar Learning Competition
The Omphalos Context-Free Language Larning Competition
A Class of Etruscan Bronze Omphalos-Bowls
Omphalos mundi: the pictorial tradition of the theme of Amsterdam and the four continents, circa 1600-1665
Learning deterministic context free grammars: The Omphalos competition
Both omphalos and margin: on how the Pa'ikwené, Palikur. See themselves to be atthe center and on the edge at the same time
Progressing the state-of-the-art in grammatical inference by competition: The Omphalos Context-Free Language Learning Competition