@misc{indiciae4642d935fd66, title = {A crystallized direct Ehrlich-positive chromogen.}, author = {F ZILLIKEN and E STEVENSON}, year = {1957}, doi = {10.1016/0003-9861(57)90264-3}, url = {https://pubmed.ncbi.nlm.nih.gov/13412139/}, note = {Source identifier: 13412139} }