COMMUNICATIONS IN STATISTICS-THEORY AND METHODS, vol. 41, no. 20, page. 3633 - 3647, 2012-09
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY, vol. 60, no. 5-8, page. 733 - 740, 2012-05
PAKISTAN JOURNAL OF STATISTICS, vol. 28, no. 1, page. 131 - 140, 2012-01