The impact of integrated aquaculture–agriculture on small-scale farms in Southern Malawi
Madan M. Dey a,*, Ferdinand J. Paraguas b , Patrick Kambewa c , Diemuth E. Pemsl d
Agricultural Economics   Volume 41 Issue 1, Pages 67 - 79
Linkages between the farm and nonfarm sectors at the household level in rural Ghana: a consistent stochastic distance function approach
Gustavo Anríquez, Silvio Daidone
Agricultural Economics  Volume 41, Issue 1, Date: January 2010, Pages: 51-66

Measuring technical efficiency in the stochastic varying coefficient frontier model
Agricultural Economics
Volume 40, Issue 4, Date: July 2009, Pages: 389-396
Giannis Karagiannis, Vangelis Tzouvelekas