id	keyword
ejpam-5790	u ⊗
ejpam-5790	∫ ∆
ejpam-5790	+ w
ejpam-5790	∆ ∫
ejpam-5790	s+k k
ejpam-5790	k w
ejpam-5790	σ 2
ejpam-5790	inequalities
ejpam-5790	1⊗d