@article{ritter_diagnosen_1964, title = {Diagnosen von {Neuen} {Kakteen}}, volume = {13}, issn = {https://onlinelibrary.wiley.com/doi/10.2307/1217799}, doi = {https://doi.org/10.2307/1217799}, number = {4}, journal = {Taxon}, author = {Ritter, Friedrich}, year = {1964}, pages = {143--145}, }