@article{MET_1989__36_3-4_176242,
     author = {A. Dey and Ashish Das},
     title = {On {Some} {E-Optimal} {Block} {Designs.}},
     journal = {Metrika},
     pages = {269--278},
     publisher = {mathdoc},
     volume = {36},
     number = {3-4},
     year = {1989},
     zbl = {0691.62069},
     url = {http://geodesic.mathdoc.fr/item/MET_1989__36_3-4_176242/}
}