Introduction: We report an investigation on collaboration practices in research papers published in the most prestigious English-medium astrophysics journals. Method: We propose an evaluation method based on three numerical indicators to study and compare, in absolute terms, three different types of collaboration (international, national and…

Discusses scientific journals in East and West Germany before and after reunification. Topics include scientific research in university and engineering schools, industrial research labs, and industrial firms; publication patterns; market share of journal articles; competition with American journals; and German versus English language. (LRW)