@article{GDZPPN002460122, title = {Approximately Optimum Two-Stage Sampling Plans.}, journal = {Metrika}, volume = {32}, year = {1985}, pages = {293-314}, zbl = {0586.62170}, url = {http://dml.mathdoc.fr/item/GDZPPN002460122} }
Arnold, B.F. Approximately Optimum Two-Stage Sampling Plans.. Metrika, Tome 32 (1985) pp. 293-314. http://gdmltest.u-ga.fr/item/GDZPPN002460122/