"Ratna De" . . . . . . . . "Dr. Ratna De (Nag)" . . "Ratna Nag" . . . . . "Ratna De (Nag)" . . . "Dr. Ratna De Nag" . . . . . . "Ratna De" . . . . . . . . "1948-09-06" . . . . . . . . . . . . "1948" . . .