Perfect double covers with paths of length four. - Katherine Heinrich; P. Horak; Walter D. Wallis; Qinglin Yu (J. Graph Theory, 1996)

On covering vertices of a graph by trees. - P. Horak; K. McAvaney (Discret. Math., 2008)

Tilings in Lee metric. - P. Horak (Eur. J. Comb., 2009)