JANČOKOVÁ, Ľudmila. Using of biorhythms at school by the application of physical activity. In Health and physical activities in lifestyle among children and youth : conference textbook of invited lectures. 1. vyd. - Banská Bystrica : Matej Bel University in Banská Bystrica, 2015. ISBN 978-80-554-1141-5, cD-ROM, s. 80-89.