Zimmer, M., Topp, W. (1997): Does leaf litter quality influence population parameters of the common woodlouse, Porcellio scaber (Crustacea: Isopoda)? Biol Fertil Soils, 24: 435-441.
Zimmer, M., Topp, W. (1997): Homeostatic responses in the gut of Porcellio scaber (Isopoda: Oniscidea) optimize litter degradation. J Comp Physiol B, 167: 582-585.
Zimmer, M., Topp, W. (1998): Do woodlice (Isopoda: Oniscidea) produce endogenous cellulases? Biol. Fertil. Soils, 26: 155-156.
Zimmer, M., Topp, W. (1998): Microorganisms and cellulose digestion in the gut of Porcellio scaber (Isopoda: Oniscidea). J Chem Ecol, 24: 1397-1408.
Zimmer, M., Topp, W. (1999): Phenology and life history of an endemic cavernicolous isopod, Venezillo tenerifensis (Isopoda: Oniscidea), from Tenerife. Vieraea, 27: 159-164.
Zimmer, M., Topp, W. (1999): Relationships between woodlice (Isopoda: Oniscidea) and microbial density and activity in the field. Biol. Fertil. Soils, 31: 391-406.