R Panduranga rao , Y.V.Seshagiri Rao, G. Y. Sagar, B. Nageswara Rao. “THE CHARACTERIZED CONCEPT OF VAGUE CO-FRAMES”. Journal of Advanced Zoology, vol. 44, no. S5, Nov. 2023, pp. 2021-30, doi:10.17762/jaz.v44iS-5.1590.