Parameter-efficient fine-tuning of small language models for code generation: a comparative study of Gemma, Qwen 2.5 and Llama 3.2. - Nguyen, Van-Viet; Nguyen, The-Vinh; Nguyen, Huu-Khanh; Vu, Duc-Quang (International Journal of Electrical & Computer Engineering (2088-8708), 2026)