00278nam a2200109Ia 4500082001900000100003800019245003300057260002600090300001600116500000500132700003100137  a519.5bW214.SN  aWallis, W. A., and Roberts, H. V.  aStatistics, a new approachb  aLondonbMethuenc1957  axiii, 646p.  a  aRoberts, H. V. ; jt. auth.