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- [2] SINGLE-VALUED AND MULTI-VALUED SCHRODINGER WAVE-FUNCTIONS HELVETICA PHYSICA ACTA, 1973, 45 (07): : 1066 - 1073
- [7] SOME COVERING THEOREMS FOR SINGLE-VALUED FUNCTIONS DOKLADY AKADEMII NAUK SSSR, 1962, 142 (01): : 29 - &
- [8] ZEROES OF A CERTAIN CLASS OF NO SINGLE-VALUED FUNCTIONS DOKLADY AKADEMII NAUK SSSR, 1959, 124 (06): : 1211 - 1214