Demand as frequency controlled reserve: implementation and practical demonstration. - Philip J. Douglass; Rodrigo Garcia-Valle; Preben Nyeng; Jacob Østergaard; Mikael Togeby (ISGT Europe, 2011)

Smart Demand for Frequency Regulation: Experimental Results. - Philip J. Douglass; Rodrigo Garcia-Valle; Preben Nyeng; Jacob Østergaard; Mikael Togeby (IEEE Trans. Smart Grid, 2013)