1
Title:A Special Variable Sample Size and Sampling Interval  Chart
Source:Communications in Statistics - Theory and Methods
Volume 38, Issue 8, 2009, Pages 1284 - 1299
Authors: Shashibhushan B. Mahadika; Digambar T. Shirkeb
DOI: 10.1080/03610920802404108
Link:http://www.informaworld.com/smpp ... ~content=a910146179
2
Economic design of X charts with variable parameters: The Markov chain approach
Journal of Applied Statistics
Volume 28, Issue 7, 2001, Pages 875 - 885
Authors: Antonio F. B. Costa; M. A. Rahim
DOI: 10.1080/02664760120074951
Link:http://www.informaworld.com/smpp ... ~content=a713674917