S. Nallam, A. Darsi, P. Veeramalla, A. Sunkesula, and S. Chiruvella, “Comparison of ultrasound guided transversus abdominis plane block with different concentrations of ropivacaine combined with fentanyl: a randomized double-blind trial”, apic, vol. 28, no. 6, pp. 1043-1049, Dec. 2024.