“…Thus , Oswatitsch was able to perform a stepwise numerical integration of the system of equations for steady Wegener and Mack (1958), Stever (1958), Pouring (1963), Hil l , Witting and Demetri (1963) , Gyarmathy and Meyer (1965), Griffin and Sherman (1965) , Duff and Hill (1966), Hill (1966), Stein (1967), We gener and Parlange (1967), Deych and F ilipov (1968), Dawson et al (1969) , Jaeger et al . (1969) Puzyrewski (1969, Wegener ( 1969) , Roberts ( 1969) , Chmielewski and Sherman (1970) , Clumpner (1970), Barschdorff (1970Barschdorff ( , 1971, Wu ( 1972) , Wegener , Clumpner and Wu ( 1972) , , and Wu ( 1 9 7 4) .…”