@article {Chopra6, author = {Vijay Kumar. Chopra and William T. Ziemba}, title = {The Effect of Errors in Means, Variances, and Covariances on Optimal Portfolio Choice}, volume = {19}, number = {2}, pages = {6--11}, year = {1993}, doi = {10.3905/jpm.1993.409440}, publisher = {Institutional Investor Journals Umbrella}, issn = {0095-4918}, URL = {https://jpm.pm-research.com/content/19/2/6}, eprint = {https://jpm.pm-research.com/content/19/2/6.full.pdf}, journal = {The Journal of Portfolio Management} }