Recommended books by various authors like Joel P Smith, Harry Marra, John Rap, Bert Vreeswijk, Frédéric Gousset, Mike Chapman, Framk Zarnowski and Dale Harder
Between 1980 and 1981, Bulgarian female athletes like Daniela Nenova, Emilia Kunova, and Valentina Dimitrova made rapid progress in pentathlon and heptathlon, setting national records and achieving personal bests in multiple competitions,