- Mulligan, R. H. 1972. A review of beech forest pathology . New Zealand Journal of Forestry 17:201-211.
- Mulligan, R. H. 1975. Platypus in beech forests. Pages 48-50 in New Zealand Forest Service, Report of Forest Research Institute for 1974. Government Printer, Wellington.
- Mulligan, R. H. 1982. Evidence for an aggregating pheromone in Platypus apicalis (Coleoptera: Platypodidae) . New Zealand Department of Scientific and Industrial Research, Entomology Division, Report 2:37-50.