Author:

Edwards,D.;Wellman,C.H.;Axe,L.

Year:

1999

Title:

Tetrads in sporangia and spore masses from Upper Silurian and Lower Devonian of the Welsh Borderland

Reference:

Edwards,D. et al. (1999) Tetrads in sporangia and spore masses from Upper Silurian and Lower Devonian of the Welsh Borderland Botanical Journal of the Linnean Society Vol. 130 # 2 P. 111- 156

Google Academy:

try to search by title in english