Abdelhamid, A. O., Fahmi, A. A. and Ali, A. B. (2011) “Reactions with hydrazonoyl halides 66: Synthesis of some new 1,3,4-thiadiazoles, triazolino[4,3-a]pyrimidines and isoxazolo[3,4-d]pyridazines containing coumarin moiety”, European Journal of Chemistry, 2(4), pp. 544–551. doi: 10.5155/eurjchem.2.4.544-551.478.