Liu Liu 0019 Felix Felgner Georg Frey Comparison of 4 numerical solvers for stiff and hybrid systems simulation. 1-8 2010 ETFA https://doi.org/10.1109/ETFA.2010.5641330 https://www.wikidata.org/entity/Q58860104 conf/etfa/2010 db/conf/etfa/etfa2010.html#LiuFF10