The cover polynomial C (D)= C (D; x, y) of a digraph D is a twovariable polynomial whose
coefficients are determined by the number of vertex coverings of D by directed paths and …

The cover polynomial C (D)= C (D; x, y) of a digraph D is a twovariable polynomial
associated with an arbitrary digraph D whose coefficients are determined by the number of …

The cover polynomial C (D)= C (D; x, y) of a digraph D is a twovariable polynomial
associated with an arbitrary digraph D whose coefficients are determined by the number of …

The cover polynomial C (D)= C (D; x, y) of a digraph D is a twovariable polynomial whose
coefficients are determined by the number of vertex coverings of D by directed paths and …

The cover polynomial C (D)= C (D; x, y) of a digraph D is a twovariable polynomial
associated with an arbitrary digraph D whose coefficients are determined by the number of …