Milieu en genetisch risico, c1985: t.p. (Dr. Luc Hens) p. 4 of cover (b. 12/5/51, biologist)

Health impacts of waste management policies, 2000: CIP t.p. (L. Hens) galley (Luc Hens, Human Ecology Dept., Vrije Universiteit Brussel)

Social and economic potential of sustainable development, 2008: t.p. (Luc Hens) added t.p. (L. Khens)