Cytostatic effects of α-difluoromethylornithine against experimental tumors in vivo : influence of gastrointestinal polyamines / Jan HesselsInduction and modulation of ornithine decarboxylase activity in human epidermis / Wim Peter ArnoldCytostatic effects of α-difluoromethylornithine against experimental tumors in vivo : influence of gastrointestinal polyamines / Jan Hessels