Lizogub VG, Riley DS, Heger M.: Efficacy of a pelargonium sidoides preparation in patients with the common cold: a randomized, double blind, placebo-controlled clinical trial. Explore (NY). 2007 Nov-Dec;3(6):573-84.
Haidvogl M, Riley DS, Heger M, Brien S, Jong M, Fischer M, Lewith GT, Jansen G, Thurneysen AE.: Homeopathic and conventional treatment for acute respiratory and ear complaints: a comparative study on outcome in the primary care setting. BMC Complement Altern Med. 2007 Mar 2;7:7.
Matthys H, Heger M.: Treatment of acute bronchitis with a liquid herbal drug preparation from Pelargonium sidoides (EPs 7630): a randomised, double-blind, placebo-controlled, multicentre study. Curr Med Res Opin. 2007 Feb;23(2):323-31.
Matthys H, Heger M.: EPs 7630-solution–an effective therapeutic option in acute and exacerbating bronchitis. Phytomedicine. 2007;14 Suppl 6:65-8. Epub 2006 Dec 20.
Haidvogl M, Heger M.: Treatment effect and safety of EPs 7630-solution in acute bronchitis in childhood: report of a multicentre observational study. Phytomedicine. 2007;14 Suppl 6:60-4. Epub 2006 Dec 20.
Matthys H, Kamin W, Funk P, Heger M.: Pelargonium sidoides preparation (EPs 7630) in the treatment of acute bronchitis in adults and children. Phytomedicine. 2007;14 Suppl 6:69-73. Epub 2006 Dec 20.
Hamre HJ, Fischer M, Heger M, Riley D, Haidvogl M, Baars E, Bristol E, Evans M, Schwarz R, Kiene H.: Anthroposophic therapy of respiratory and ear infections. Wien Klin Wochenschr. 2005 Jul;117(13-14):500-1.
Hamre HJ, Fischer M, Heger M, Riley D, Haidvogl M, Baars E, Bristol E, Evans M, Schwarz R, Kiene H.: Anthroposophic vs. conventional therapy of acute respiratory and ear infections: a prospective outcomes study. Wien Klin Wochenschr. 2005 Apr;117(7-8):256-68.
Matthys H, Eisebitt R, Seith B, Heger M.: Efficacy and safety of an extract of Pelargonium sidoides (EPs 7630) in adults with acute bronchitis. A randomised, double-blind, placebo-controlled trial. Phytomedicine 2003; 10 Suppl 4:7-17.
Bereznoy VV, Riley DS, Wassmer G, Heger M.: Efficacy of extract of Pelargonium sidoides in children with acute non-group A beta-hemolytic streptococcus tonsillopharyngitis: a randomized, double-blind, placebo-controlled trial. Altern Ther Health Med 2003; 9 (5):68-79.
Wolf M, Tamaschke C, Mayer W, Heger M.: [Efficacy of Arnica in varicose vein surgery: results of a randomized, double-blind, placebo-controlled pilot study]. [Article in German] Forsch Komplementarmed Klass Naturheilkd. 2003 Oct;10(5):242-7.
Riley D, Fischer M, Singh B, Haidvogl M, Heger M.: Homeopathy and conventional medicine: an outcomes study comparing effectiveness in a primary care setting. J Altern Complement Med. 2001 Apr;7(2):149-59.
Vickers AJ, van Haselen R, Heger M.: Can homeopathically prepared mercury cause symptoms in healthy volunteers? A randomized, double-blind placebo-controlled trial. J Altern Complement Med. 2001 Apr;7(2):141-8.
Heger M, Riley DS, Haidvogl M.: International integrative primary care outcomes study (IIPCOS-2): an international research project of homeopathy in primary care. Br Homeopath J. 2000 Jul;89 Suppl 1:S10-3.