A. Millere, Z. Kalnberza-Ribule, A. Nulle, L. Deklava, and I. Millere, “STRESS COPING AS A PSYCHOLOGICAL FACTOR FOR CHRONIFICATION OF LOW BACK PAIN”, SIE, vol. 4, pp. 144–153, May 2018, doi: 10.17770/sie2018vol1.3227.