Stem antiport$ (all stems)
2 papers:
DLT-2005-AlhazovFO- Tissue P Systems with Antiport Rules and Small Numbers of Symbols and Cells (AA, RF, MO), pp. 100–111.
DLT-2004-Verlan- Tissue P Systems with Minimal Symport/Antiport (SV), pp. 418–430.
DLT-2005-AlhazovFO
DLT-2004-Verlan