LEMMA OF BISHOP AND PHELPS

[1] BISHOP E, 1963, 7 P S PUR MATH CONV, P27

[2] ON SUBDIFFERENTIABILITY OF CONVEX FUNCTIONS [J]. PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, 1965, 16 (04) : 605 - +

[3] BROWDER F. E., 1971, J FUNCT ANAL, V8, P250

[4] Danes, 1972, B UNIONE MAT ITAL, V6, P369

[5] EKELAND I, 1972, CR ACAD SCI A MATH, V275, P1057

[6] SUPPORT CONES IN BANAH SPACES AND THEIR APPLICATIONS [J]. ADVANCES IN MATHEMATICS, 1974, 13 (01) : 1 - 19

[7] WEAK SUPPORT POINTS OF CONVEX SETS IN E [J]. ISRAEL JOURNAL OF MATHEMATICS, 1964, 2 (03) : 177 - &

[8] PHELPS RR, 1963, 7 P S PUR MATH, P393

[1] BISHOP E, 1963, 7 P S PUR MATH CONV, P27

[2] ON SUBDIFFERENTIABILITY OF CONVEX FUNCTIONS [J]. PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY, 1965, 16 (04) : 605 - +

[3] BROWDER F. E., 1971, J FUNCT ANAL, V8, P250

[4] Danes, 1972, B UNIONE MAT ITAL, V6, P369

[5] EKELAND I, 1972, CR ACAD SCI A MATH, V275, P1057

[6] SUPPORT CONES IN BANAH SPACES AND THEIR APPLICATIONS [J]. ADVANCES IN MATHEMATICS, 1974, 13 (01) : 1 - 19

[7] WEAK SUPPORT POINTS OF CONVEX SETS IN E [J]. ISRAEL JOURNAL OF MATHEMATICS, 1964, 2 (03) : 177 - &

[8] PHELPS RR, 1963, 7 P S PUR MATH, P393