@ARTICLE { Rsds988,
author = {Obtulowicz, Adam}, 
title = {Mathematical models of uncertainty with a regard to membrane systems}, 
journal = {Natural Computing: An International Journal}, 
number = 	{(no. 3)}, 
volume = 2, 
pages = {251-263}, 
publisher = {Elsevier Science Inc.}, 
address = {Amsterdam, The Netherlands}, 
year = 2003, 
abstract = {A brief review is presented of the known mathematical models of uncertainty taking into account its grounds such as randomness, indiscernibility, and vagueness. Then, one discusses the models of the uncertainty caused by indiscernibility and random indiscernibility with a regard to membrane systems. The discussed models include rough sets, probabilistic rough sets, and probabilistic fuzzy sets. An algebraic characterization of P systems is presented, which makes possible to \"transfer'' the methods of Petri net theory to P system theory including the approach of the first theory to models of uncertainty.}, 
keywords = {Petri nets, fuzzy sets, membrane computing, }, 
}