by Martin Schilling
The development of co-authorship happened in three phases, although in comparison, during the past two centuries co-operation in science increased in an exponential function. The little group of scientists (the scientific Úlite) who are published very often, when comparing the size of their group to others, are published at a rate much above average. It can empirically be proven that a publisher with similar publication numbers typically publishes using reinforcement ("birds of a feather flock together"). This effect is especially often found with authors with particularly high or notably low publication numbers (corner effect of homophile). This rule applies also to co-authorship over longer distances ("Invisible College"). Above all modern possibilities of communication support these long-distance networks. The progressing digitalization changes the structure and inspires the growth of co-authorship. This is possibly the beginning of a new phase in the development of co-authorship.