Sultan, T. (1977). An optimum expanded model of control charts when there are several assignable causes. , 01(1), 103-113.
T. I. Sultan. "An optimum expanded model of control charts when there are several assignable causes". , 01, 1, 1977, 103-113.
Sultan, T. (1977). 'An optimum expanded model of control charts when there are several assignable causes', , 01(1), pp. 103-113.
Sultan, T. An optimum expanded model of control charts when there are several assignable causes. , 1977; 01(1): 103-113.