Text ( visual ) : unmediated Advanced topics in fuzzy graph theory / John N. Mordeson, Sunil Mathew. -- Cham : Springer , c2019. -- xv, 209 p. : ill., col. maps ; 25 cm. -- (Studies in fuzziness and soft computing ; v. 375). -- Includes bibliographical references (p. 197-206) and index. -- ISBN 9783030042141 ; (BB2807910X) ; https://ci.nii.ac.jp/ncid/BB2807910X Author Heading(s): Mordeson, John N. ; Mathew, Sunil