Khowaja-Ateequzzaman, Garg, R. and Jain, K. 1988. Observations on archaeopyle type in fossil dinoflagellate cyst species Dingodinium Cerviculum Cookson & Eisenack 1958. Journal of Palaeosciences. 37, (1-3) (Dec. 1988), 267–277. DOI:https://doi.org/10.54991/jop.1988.1623.