Author:Sarjeant,W.A.S.;Stancliffe,R.P.W. Year:1996 Title:The acritarch genus Polygonium, Vavrdova emend. Sarjeant and Stancliffe 1994: a reassessment of its constituent species. (In: Stratigraphie du Mesozoique et du Cenozoique. M.Streel, editor) Reference: Sarjeant,W.A.S. et al. (1996) The acritarch genus Polygonium, Vavrdova emend. Sarjeant and Stancliffe 1994: a reassessment of its constituent species. (In: Stratigraphie du Mesozoique et du Cenozoique. M.Streel, editor) Annales de la Soci©t© G©ologique de Belgique Vol. 117 # 2 P. 355- 369 Google Academy: try to search by title in english