edited by A. Hajnal, R. Rado, Vera T. Sos
North-Holland, 1975
Buku Teks
edited by Gunter Asser, Jurgen Flachsmeyer, Willi Rinow
Web Deutscher der Wissenschaften, 1972
Buku Teks
Landman, Fred, author
Blackwell, 2003
Buku Teks
Pfeiffer, Paul E., author
McGraw-Hill, 1964
Buku Teks
Atanassov, Krassimir T., author
[Springer, Springer], 2012
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