1 9 7 1 ▁when ▁the ▁International ▁Mathemat ical ▁Union ▁met ▁in ▁Moscow . ▁From ▁about ▁ 1 9 7 1 ▁he ▁moved ▁to ▁work ▁in ▁the ▁field ▁of ▁is os pect ral ▁flows , ▁with ▁connections ▁to ▁the ▁theory ▁of ▁the ta ▁functions . ▁Nov ik ov ' s ▁conject ure ▁about ▁the ▁Riemann – Sch ott ky ▁problem ▁( character izing ▁princip ally ▁polar ized ▁ab elian ▁vari eties ▁that ▁are ▁the ▁Jacob ian ▁of ▁some ▁algebraic ▁curve ) ▁stated , ▁essentially , ▁that ▁this ▁was ▁the ▁case ▁if ▁and ▁only ▁if ▁the ▁corresponding ▁the ta ▁function ▁provided ▁a ▁solution ▁to ▁the ▁K ad om t se v – P et vi ash v ili ▁equation ▁of ▁solit on ▁theory . ▁This ▁was ▁proved ▁by ▁Sh i ota ▁( 1 9 8 6 ), ▁following ▁earlier ▁work ▁by ▁Ar b arel lo ▁and ▁de ▁Conc ini ▁( 1 9 8 4 ), ▁and ▁by ▁Mul ase ▁( 1 9 8 4 ). ▁ ▁Later ▁career ▁Since ▁ 1 9 7 1 ▁Nov ik ov ▁has ▁worked ▁at ▁the ▁Land au ▁Institute ▁for ▁The oret ical ▁Physics ▁of ▁the ▁USS R ▁Academy ▁of ▁Sciences . ▁In ▁ 1 9 8 1 ▁he ▁was ▁elected ▁ ▁a ▁Full ▁Member ▁of ▁the ▁USS R ▁Academy ▁of ▁Sciences ▁( Russ ian ▁Academy ▁of ▁Sciences ▁since ▁ 1 9 9 1 ). ▁In ▁ 1 9 8 2 ▁Nov ik ov ▁was ▁also ▁appointed ▁the ▁Head ▁of ▁the ▁Chair ▁in ▁High er ▁Ge ometry ▁and ▁Top