APA

Ramesh Kumar, University of Delhi. Faculty of Mathematical Sciences. Department of Mathematics, Dr S C Arora Gu, Prof B S Yadav Gu & University of Delhi. Faculty of Mathematical Sciences. Department of Mathematics. (1980). Essential numerical ranges and essential spectra of hilbert space operators. : .

Chicago

Ramesh Kumar, University of Delhi. Faculty of Mathematical Sciences. Department of Mathematics, Dr S C Arora Gu, Prof B S Yadav Gu and University of Delhi. Faculty of Mathematical Sciences. Department of Mathematics. 1980. Essential numerical ranges and essential spectra of hilbert space operators. : .

Harvard

Ramesh Kumar, University of Delhi. Faculty of Mathematical Sciences. Department of Mathematics, Dr S C Arora Gu, Prof B S Yadav Gu and University of Delhi. Faculty of Mathematical Sciences. Department of Mathematics. (1980). Essential numerical ranges and essential spectra of hilbert space operators. : .

MLA

Ramesh Kumar, University of Delhi. Faculty of Mathematical Sciences. Department of Mathematics, Dr S C Arora Gu, Prof B S Yadav Gu and University of Delhi. Faculty of Mathematical Sciences. Department of Mathematics. Essential numerical ranges and essential spectra of hilbert space operators. : . 1980.