How many movies have Boris Travkin and Valeriy Kharitonov collaborated on?

They have worked on 6 movies together! Their first movie together was Загадки звёздного неба: Неуловимый горизонт (1984) and was their highest rated movie together. They have not worked together since Загадки звёздного неба: Откуда взялись телескопы (1985). They are most known for their family films together.