Erik F. Eriksen, et al. “The Efficacy of Adjunctive Therapy With LithoLexal®Respiro in Adult Patients With Moderate-to-Severe COPD: A Real-World Objective and Subjective Study”. Pulmonary Research and Respiratory Medicine, vol. 6, no. 1, Mar. 2024, pp. 4-10, doi:10.17140/prrmoj-6-141.