Britannica (анлайн) Encyclopædia Britannica Ivan Pavlov Ivan Petrovich Pavlov Ivan Pavlov http://www.britannica.com/biography/Ivan-Pavlov Ivan Pavlov Encyclopædia Britannica Ivan Pavlov Ivan Pavlov Ivan Petrovich Pavlov ID http://www.britannica.com/biography/Ivan-Pavlov http://www.britannica.com/biography/Ivan-Pavlov Britannica (онлайн) Ivan Pavlov Pavlov http://www.britannica.com/biography/Ivan-Pavlov