TY - BOOK AU - Zinkgraf,Stephen A. TI - Six sigma: the first 90 days SN - 9780131687400 AV - HD62.15 .Z56 2006 PY - 2006/// CY - Upper Saddle River, N. J. PB - Prentice Hall KW - Six sigma (Quality control standard) N1 - Includes index ER -