Serratia marcescens strains

[chihara]

In the past I used a series of cultures to demonstrate cross feeding in 
serratia for my genetics class. I have lost the reference and wonder if 
anyone knows which strains are necessary (they included 9-3-3, WF, HY 
and about 5 others).  They were all mutant for some enzymes in the 
production of a red or purple pigment. I can't seem to find a reference 
to these strain names in ATCC. Any help is appreciated.