1. Botanique, Anatomie-Cycles évolutifs-Systématique;Abbayes,1963
2. Three abietaceous cones from the Wealden of Belgium;Alvin;Mém. Inst. R. Sci. Nat. Belg.,1953
3. On two cones Pseudoaraucaria heeri (Coemans) nov. comb. and Pityostrobus villerotensis nov. sp. from the Wealden of Belgium;Alvin;Mem. Inst. R. Sci. Nat. Belg.,1957
4. Further conifers of the Pinaceae from the Wealden Formation of Belgium;Alvin;Mém. Inst. R. Sci. Nat. Belg.,1960
5. The spore-bearing organs of the Cretaceous fern Weichselia Stiehler;Alvin;J. Linn. Soc. (Bot.),1968