1. J.P. Arrington, L.L. Wade, US Patent 4, 215, 129 (1980).
2. Syntheses and Insecticidal Activities of Novel2,5-Disubstituted-1,3,4-oxadiazoles
3. X. Ian, R. Gang, G. Song, H. Yu, The preparation and application of 2,5-disubstituted-1,3,4-oxadiazoles (thiadiazoles), CN Patent 91, 1, 16834.8 (Appl. No.) (1999).