A minimally strongly-connected graph is a tree of strong links where any node in the tree can be seen as the root, i.e. a reference node from which there is only one path connecting it with any other.
The scene in Judge Snyder's courtroom where Lisa is put on trial for stealing the skeleton is seen as a reference to the 1920s Scopes Monkey Trial in Dayton, Tennessee, which dealt with issues of separation of church and state and the debate between creationism and evolution.
The remark about fascists was seen as a reference to the conspiratorial Đại Việt Quốc dân đảng who had long been enemies of Diem, but his address attacked all those who had criticised him in the past.
Although evidently intended to refer to the immediate future, since the kingdom of Moab had long ceased to exist, by the time the Gospels were being written this had become widely seen as a reference to the coming of a Messiah.
The former president's remarks were seen as a reference to the release of Romney's 2011 tax return on Friday, which showed the Republican candidate paid an effective tax rate of 14.1% on $13.7m in income.
The remarks by the official, Field Marshal Mohamed Hussein Tantawi, did not mention the Brotherhood by name but were widely seen as a reference to the group and to Mohamed Morsi, Egypt's newly elected president and a former Brotherhood leader.
In his Christmas Eve speech the king expressed concern over what he described as the declining confidence among Spaniards in public institutions, a remark seen as a reference to the scandal surrounding his son-in-law, a commoner who used to be a professional handball player.
The effect of the photographs hung in a line can also be seen as a reference to the wall that once divided East and West Germany.
Essentially, with the complexities involved in many of our daily lives, something as simple as a checklist can been seen as a reference tool providing the steps we need to follow, in order to execute our responsibilities effectively and efficiently.
