25 Nested designs. - John P. Morgan (Design and analysis of experiments, 1996)

Nested balanced incomplete block designs. - John P. Morgan; Donald A. Preece; David H. Rees (Discret. Math., 2001)

Designs on the web. - Rosemary A. Bailey; Peter J. Cameron; Peter Dobcsányi; John P. Morgan; Leonard H. Soicher (Discret. Math., 2006)