. . "Perturbation (Mathematics)"@en . _:bnode7authoritiessubjectssh85100181 . _:bnode7authoritiessubjectssh85100181 _:bnode8authoritiessubjectssh85100181 . _:bnode7authoritiessubjectssh85100181 . _:bnode8authoritiessubjectssh85100181 . _:bnode8authoritiessubjectssh85100181 "Perturbation (Mathematics)"@en . . . . . . . . . . "QA871" . . . . _:bnode25authoritiessubjectssh85100181 . _:bnode25authoritiessubjectssh85100181 . _:bnode25authoritiessubjectssh85100181 . _:bnode25authoritiessubjectssh85100181 "Perturbation equations"@en . _:bnode25authoritiessubjectssh85100181 _:bnode30authoritiessubjectssh85100181 . _:bnode30authoritiessubjectssh85100181 _:bnode31authoritiessubjectssh85100181 . _:bnode30authoritiessubjectssh85100181 . _:bnode31authoritiessubjectssh85100181 . _:bnode31authoritiessubjectssh85100181 "Perturbation equations"@en . _:bnode34authoritiessubjectssh85100181 . _:bnode34authoritiessubjectssh85100181 . _:bnode34authoritiessubjectssh85100181 . _:bnode34authoritiessubjectssh85100181 "Perturbation theory"@en . _:bnode34authoritiessubjectssh85100181 _:bnode39authoritiessubjectssh85100181 . _:bnode39authoritiessubjectssh85100181 _:bnode40authoritiessubjectssh85100181 . _:bnode39authoritiessubjectssh85100181 . _:bnode40authoritiessubjectssh85100181 . _:bnode40authoritiessubjectssh85100181 "Perturbation theory"@en . . . _:bnode45authoritiessubjectssh85100181 . _:bnode45authoritiessubjectssh85100181 . _:bnode45authoritiessubjectssh85100181 "1986-02-11T00:00:00"^^ . _:bnode45authoritiessubjectssh85100181 "new"^^ . _:bnode45authoritiessubjectssh85100181 .