GRAS法(Generalized RAS, matrix balancing/updating, biproportional method)是对RAS法的改进,具体文献可参考:
1) Junius T. and J. Oosterhaven (2003), The solution of updating or regionalizing a matrix with both positive and negative entries, Economic Systems Research, 15, pp. 87-96.
2) Lenzen M., R. Wood and B. Gallego (2007), Some comments on the GRAS method, Economic Systems Research, 19, pp. 461-465.
3) Temurshoev, U., R.E. Miller and M.C. Bouwmeester (2013), A note on the GRAS method, Economic Systems Research, 25,p. 361-367.