$\pi_1$- and $\pi_2$-theories of operators (Problems in the Calculus of Variations and Related Topics)

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@article{61ac057dcf96497db1d62c7ead3a050d,

title = "$\pi_1$- and $\pi_2$-theories of operators (Problems in the Calculus of Variations and Related Topics)",

author = "Shunsaku Nii",

year = "2009",

month = feb,

language = "English",

volume = "1628",

pages = "58--62",

journal = "RIMS Kokyuroku",

issn = "1880-2818",

publisher = "京都大学出版会",

}