Vanclay, JK 1991, 'Seed orchard design by computer', Silvae Genetica, vol. 40, no. 3-4, pp. 89-91.
The original publication is available at http://www.sauerlaender-verlag.com/
A computer program creates permuted neighbourhood designs for second generation seed orchards which may include a high proportion of related clones. It maximizes panmixis, and ensures isolation of all related clones. It is fast, efficient and easy to use. Copies of the program are available from the author.