The P-4-tidy graphs were introduced by I. Rusu to generalize some alre
ady known classes of graphs with ''few'' induced P-4 s. In this paper,
we extend to P-4-tidy graphs a linear time algorithm of C.-H. Yang an
d M.-S. Yu for finding a maximum matching in a cograph G (given a pars
e tree associated to G). (C) 1997 Elsevier Science B.V.