00271nam a2200109 a 450000500170000008200190001710000170003611000210005324500410007426000290011530000170014420251203091554.0  a511.5,bD, kon  aKonig, Denes  aMcCoart, Richard  aTheory of finite and infinite graphs  aBostonbBirkhauserc1990  a426p, 22 cm.