H. A. Johanna

IN SITU GYMNOSPERM POLLEN FROM THE MIDDLE JURASSIC OF YORKSHIRE

H. A. Johanna, Van Konijnenburg‐Van Gittert, 1971 .

Aspects of Romanian Early-Middle Jurassic palaeobotany and palynology. Part VII. Successions and floras

M. Popa, V. Cittert, H. A. Johanna, 2006 .