@article {Butler41, author = {Kirt C. Butler and Dale L. Domian}, title = {Risk, diversification, and the investment horizon}, volume = {17}, number = {3}, pages = {41--47}, year = {1991}, doi = {10.3905/jpm.1991.409334}, publisher = {Institutional Investor Journals Umbrella}, issn = {0095-4918}, URL = {https://jpm.pm-research.com/content/17/3/41}, eprint = {https://jpm.pm-research.com/content/17/3/41.full.pdf}, journal = {The Journal of Portfolio Management} }