Wernerfelt, Birger. International Journal for Fuzzy Sets and Systems Vol. 19, No. 1 (1986): 21-28.
Fornell, Claes, William T. Robinson and Birger Wernerfelt. Management Science Vol. 31, No. 9 (1985): 1089-1105.
Wernerfelt, Birger. Management Science Vol. 31, No. 8 (1985): 928-939.
Sappington, David E.M. and Birger Wernerfelt. Journal of Business Vol. 58, No. 3 (1985): 279-293.
Wernerfelt, Birger. Management Science, April 1985.
Wernerfelt, Birger. Journal of Economic Behavior and Organization Vol. 6, No. 4 (1985): 381-385.