Gropper DM, SB Caudill and TR Beard (1999). “Estimating Multiproduct Cost Functions over Time Using a Mixture of Normals.” JPA 11(3): 201-218.
Gropper DM, SB Caudill and TR Beard (1999). “Estimating Multiproduct Cost Functions over Time Using a Mixture of Normals.” JPA 11(3): 201-218.