Neitzel, H. Max Planck Society;
Kalscheuer, V. Max Planck Society;
Henschel, S. Max Planck Society;
Digweed, M. Max Planck Society;
Sperling, K. Max Planck Society;
http://www.ncbi.nlm.nih.gov/pubmed/9678352 (Any fulltext)
Neitzel, H., Kalscheuer, V., Henschel, S., Digweed, M., & Sperling, K. (1998). Beta-heterochromatin in mammals: evidence from studies in Microtus agrestis based on the extensive accumulation of L1 and non-L1 retroposons in the heterochromatin. Cytogenet Cell Genet, 80(1-4), 165-72. doi:10.1159/000014974.