Theera Rukkwamsuk, Nitipong Homwong, Weerapong Bumkhuntod, Piyakan Rohitakanee and Rungthip Sukcharoen 2006. Negative Energy Balance in Periparturient Dairy Cows Raised in Small-Holder Farms in Kamphaengsaen District, Nakhon Pathom Province. Agriculture and Natural Resources. 40, 4 (Aug. 2006), 1000–1004.