Mawhin, J. (1979)

Equadiff IV

Knobloch, H. W. (1979)

Equadiff IV

Velte, Waldemar (1982)

Equadiff 5

Kružhkov, Stanislav N. (1982)

Equadiff 5

Malikov, Khoris M. (1982)

Equadiff 5

Axelsson, O. (1990)

Equadiff 7

(1963)

Differential Equations and Their Applications

(1979)

Equadiff IV

(1990)

Equadiff 7

(1982)

Equadiff 5

(1994)

Equadiff 8

(1973)

Proceedings of Equadiff III

Conti, R. (1979)

Equadiff IV

Conti, Roberto (1982)

Equadiff 5

Weinelt, Wilfried (1982)

Equadiff 5

Lovicar, Vladimír (1973)

Proceedings of Equadiff III

Zlámal, Miloš (1973)

Proceedings of Equadiff III

Vosmanský, J. (1990)

Equadiff 7

Coddington, E. A. (1979)

Equadiff IV

(1982)

Equadiff 5