Her Netherlands oil and gas law, c1991: t.p. (Martha M. Roggenkamp, Internat'l Institut voor Energieirecht)

Het juridisch kader van pijpleidingen ... 1999: t.p. (Martha Margrethe Roggenkamp, b. 1955)

Energy networks and the law, 202: t.p. (Martha M. Roggenkamp) p. xx (professor of energy law, Univ. of Groningen; director, Groningen Centre of Energy Law; board member, Groningen Energy and Sustainability Programme; chair, Dutch Energy Law Association)