5 citations as recorded by crossref.

1. Organization and system of geography H. Uhlig https://doi.org/10.1016/0016-7185(71)90159-X
2. CURRENT GEOGRAPHIC THOUGHT IN THE GERMAN LANGUAGE AREA H. Carol https://doi.org/10.1111/j.0033-0124.1959.115_11.x
3. THE NATURE OF FRONTIERS AND BOUNDARIES L. KRISTOF https://doi.org/10.1111/j.1467-8306.1959.tb01613.x
4. STAGES OF TECHNOLOGY AND THEIR IMPACT UPON THE PHYSICAL ENVIRONMENT: A BASIC PROBLEM IN CULTURAL GEOGRAPHY H. CAROL https://doi.org/10.1111/j.1541-0064.1964.tb00575.x
5. Organisationsplan und system der geographie H. Uhlig https://doi.org/10.1016/0016-7185(70)90005-9