Welsh, D. J. A. Matroid theory/ D. J. A. Welsh. - London New York: Academic Press, 1976. - xi, 433 p.: diagrs.; 24 cm. - L.M.S. monographs 8. . Includes indexes. Bibliography: p. 402-423. ISBN: 012744050X LCCN: 76010493 //r89 Nat. Bib. No.: GB*** Subjects--Topical Terms: Matroids Dewey Class. No.: 511.6 / W461m