Dončev, A. L., & Zolezzi, T. [ca. 1993]. Well-posed optimization problems. In Lecture notes in mathematics [Book]. Berlin [u.a.]: Springer.

DONČEV, Asen L. und ZOLEZZI, Tullio, 1993. Well-posed optimization problems. Berlin [u.a.]: Springer. Lecture notes in mathematics, 1543. ISBN 3540567372.

Dončev, A. L., und T. Zolezzi. „Well-posed optimization problems“. Lecture notes in mathematics, book, Springer, 1993.

Dončev, Asen L./Zolezzi, Tullio: Well-posed optimization problems, . Lecture notes in mathematics, Berlin [u.a.] 1993.

Dončev, A.L. und Zolezzi, T. (1993), Well-posed optimization problems, Lecture notes in mathematics, Bd. , Springer, Berlin [u.a.].