TY - JOUR AU - Michael Donahue C2 - Journal of Applied Physics DA - 1998-06-01 LA - en M1 - 83 PB - Journal of Applied Physics PY - 1998 TI - A Variational Approach to Exchange Energy Calculations in Micromagnetics UR - https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=150718 ER -