id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
cet-211		cet-211		6	.pdf	application/pdf	3720	226	70	Where αij represents if the plant i connects plant j: αij =1 when they are connected; αij =0 when they are not connected, UICij is unit interconnection cost between plants i and j, and dij is the interconnected distance between plants i and j. ⋅ = ⋅ ⋅ ⋅ (6) Where x1i and y1i are the lower left coordinates of plant i, x1j and y1j are the lower left coordinates of plant j, x2i and y2i are the upper right coordinates of plant i, x2j and y2j are the upper right coordinates of plant j. Constraints (3)-(6) represent the plant i is on the left, right, top and bottom sides of the plant j respectively.	cache/cet-211.pdf	txt/cet-211.txt