Rudolf Freund, Sergiu Ivanov, Sergey Verlan. P Systems with Generalized Multisets Over Totally Ordered Abelian Groups.
Membrane Computing - 16th International Conference, CMC 2015, Valencia, Spain, August 17-21, 2015, Revised Selected Papers, 2015, Unknown, Unknown Region. pp.117--136,
⟨10.1007/978-3-319-28475-0_9⟩.
⟨hal-01352290⟩ 
