Authors: Sjaastad, O Fredriksen, TA

Citation: O. Sjaastad et Ta. Fredriksen, Cervicogenic headache: Criteria, classification and epidemiology, CLIN EXP RH, 18(2), 2000, pp. S3-S6

Authors: Fredriksen, TA Sjaastad, O

Citation: Ta. Fredriksen et O. Sjaastad, Cervicogenic headache: Current concepts of pathogenesis related to anatomical structure, CLIN EXP RH, 18(2), 2000, pp. S16-S18

Authors: Fredriksen, TA Salvesen, R Stolt-Nielsen, A Sjaastad, O

Citation: Ta. Fredriksen et al., Cervicogenic headache: long-term postoperative follow-up, CEPHALALGIA, 19(10), 1999, pp. 897-900

Authors: Sjaastad, O Stolt-Nielsen, A Pareja, JA Fredriksen, TA Vincent, M

Citation: O. Sjaastad et al., Supraorbital neuralgia. On the clinical manifestations and a possible therapeutic approach, HEADACHE, 39(3), 1999, pp. 204-212