Khanna and Singh, 1981b
From dinoflaj3
Khanna, A.K. and Singh, H.P., 1981b: Some new dinoflagellates, spores and pollen grains from the Subathu Formation (Upper Palaeocene-Eocene) of Simla Hills, India. Himalayan Geology, v.9, no.1, p.385-419. (Cover date 1979, issue date 1981.)