ANALYSIS AND A THEORY OF VISIBLE BIRD MIGRATION

[11] ALERSTAM T, 1976, THESIS U LUND

[12] [Anonymous], 1956, SWIFTS TOWER

[13] [Anonymous], STATISTICAL PACKAGE

[14] AXELL HE, 1963, BIRD NOTES, V30, P181

[15] BELLROSE FC, 1967, 14 P INT ORN C, P281

[16] Bergman G., 1964, Acta Zoologica Fennica, VNo. 105, P1

[17] BERGMAN G, 1950, MEM SOC FAUNA FLORA, V27, P14

[18] Bernis F., 1975, Ardeola, V21, P489

[19] Berthold P., 1975, AVIAN BIOL, VV, P77, DOI DOI 10.1016/B978-0-12-249405-5.50010-0

[20] BLYUMENTAL T I, 1973, P125

[11] ALERSTAM T, 1976, THESIS U LUND

[12] [Anonymous], 1956, SWIFTS TOWER

[13] [Anonymous], STATISTICAL PACKAGE

[14] AXELL HE, 1963, BIRD NOTES, V30, P181

[15] BELLROSE FC, 1967, 14 P INT ORN C, P281

[16] Bergman G., 1964, Acta Zoologica Fennica, VNo. 105, P1

[17] BERGMAN G, 1950, MEM SOC FAUNA FLORA, V27, P14

[18] Bernis F., 1975, Ardeola, V21, P489

[19] Berthold P., 1975, AVIAN BIOL, VV, P77, DOI DOI 10.1016/B978-0-12-249405-5.50010-0

[20] BLYUMENTAL T I, 1973, P125