S. C. Saxena and Y. Saxena, “On synergised and unsynergised pyrethrum. Their toxicity to Dysdercus cingulatus Fabricius and persistency of the toxic effect of the films”., contrib.entomol., vol. 15, no. 1-2, pp. 167–174, Mar. 1965, doi: 10.21248/contrib.entomol.15.1-2.167-174.