PUTTY-CLAY

[1] Courant R, 1957, CALCULUS VARIATIONS

[2] HAHN FH, 1964, EC J DEC

[3] JOHANSEN L, 1959, ECONOMETRICA APR

[4] KEMP MC, 1966, ECONOMETRICA APR

[5] KOOPMANS TC, 163 COWL F DISC PAP

[6] MATTHEWS RCO, 1964, Q J EC FEB

[7] PHELPS ES, 1963, INT EC REV SEP

[8] Salter W. E. G., 1960, PRODUCTIVITY TECHNIC

[9] SOLOW RM, 1966, REV EC STUDIES APR

[10] SOLOW RM, 1962, REV EC STUDIES JUN

[1] Courant R, 1957, CALCULUS VARIATIONS

[2] HAHN FH, 1964, EC J DEC

[3] JOHANSEN L, 1959, ECONOMETRICA APR

[4] KEMP MC, 1966, ECONOMETRICA APR

[5] KOOPMANS TC, 163 COWL F DISC PAP

[6] MATTHEWS RCO, 1964, Q J EC FEB

[7] PHELPS ES, 1963, INT EC REV SEP

[8] Salter W. E. G., 1960, PRODUCTIVITY TECHNIC

[9] SOLOW RM, 1966, REV EC STUDIES APR

[10] SOLOW RM, 1962, REV EC STUDIES JUN