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"Hisaaki Endo,Andrei Pajitnov","Circle-valued Morse theory for spun knots and surface-links",,"The Michigan Mathematical Journal",,"Vol. 66","No. 4","pp. 813-830",2017,Nov.
"Hisaaki Endo,Andrei Pajitnov","On the Morse-Novikov number for 2-knots",,"Osaka Journal of Mathematics",,"Vol. 54","No. 4","pp. 725-736",2017,Oct.