@article{05052087, title = {Mechanical Lagrangian systems with external forces.}, journal = {APPS. Applied Sciences}, volume = {8}, year = {2006}, pages = {132-137}, zbl = {1099.70014}, language = {en}, url = {http://dml.mathdoc.fr/item/05052087} }
Nimineţ, Valer. Mechanical Lagrangian systems with external forces.. APPS. Applied Sciences, Tome 8 (2006) pp. 132-137. http://gdmltest.u-ga.fr/item/05052087/