%0 Journal Article %T An economic production lot size model with price discounting for non-instantaneous deteriorating items with ramp-type production and demand rates %A G. Garg %A B. Vaish %A S. Gupta %J International Journal of Contemporary Mathematical Sciences %D 2012 %I %U http://www.m-hikari.com/ijcms/ijcms-2012/9-12-2012/gargIJCMS9-12-2012.pdf