Lönnig, W.-E. Dept. of Molecular Plant Genetics (Heinz Saedler), MPI for Plant Breeding Research, Max Planck Society;
Lönnig, W.-E. (2006). Mutations: the law of recurrent variation. In T. d. Silva, & J. A (Eds.), Floriculture, Ornamental and Plant Biotechnology (pp. 601-607). London: Global Science Books.