@article {Bierman42, author = {Harold Bierman, Jr.}, title = {How Much Diversification is Desirable?}, volume = {7}, number = {1}, pages = {42--44}, year = {1980}, doi = {10.3905/jpm.1980.42}, publisher = {Institutional Investor Journals Umbrella}, issn = {0095-4918}, URL = {https://jpm.pm-research.com/content/7/1/42}, eprint = {https://jpm.pm-research.com/content/7/1/42.full.pdf}, journal = {The Journal of Portfolio Management} }