B. L. . Capehart, C. E. . Salas, W. C. . Turner, and S. A. . Parker, “N EW C ERTIFICATION PROGRAM AVAILABLE FOR DISTRIBUTED G ENERATION AND COMBINED HEAT AND P OWER P ROFESSIONALS”, DGAEJ, vol. 18, no. 3, pp. 71–80, Jun. 2003.