Symposium on Convexity and Duality in Optimization (1984 : University of Groningen) & Ponstein, J. (1985). Convexity and duality in optimization: Proceedings of the Symposium on Convexity and Duality in Optimization held at the University of Groningen, the Netherlands, June 22, 1984. Springer-Verlag.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Symposium on Convexity and Duality in Optimization (1984 : University of Groningen) و Jacob Ponstein. Convexity and Duality in Optimization: Proceedings of the Symposium on Convexity and Duality in Optimization Held at the University of Groningen, the Netherlands, June 22, 1984. Berlin: Springer-Verlag, 1985.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Symposium on Convexity and Duality in Optimization (1984 : University of Groningen) و Jacob Ponstein. Convexity and Duality in Optimization: Proceedings of the Symposium on Convexity and Duality in Optimization Held at the University of Groningen, the Netherlands, June 22, 1984. Springer-Verlag, 1985.