@book{Wollenberg1994, author = {Wollenberg, Manfred}, title = {On an inverse problem in modular theory}, series = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik}, volume = {1994, 07}, journal = {Preprint / Universit{\"a}t Potsdam, Institut f{\"u}r Mathematik}, publisher = {Univ.}, address = {Potsdam}, pages = {14 S.}, year = {1994}, language = {en} }