Skachkova, Maria Evgenievna, and Olga Jurjevna Lepikhina. “Methods of Standard Rates of Financial Expenses Calculation on Landscaped Areas Maintenance (on the Example of St. Petersburg, Russia)”. International Journal of Economics and Financial Issues, vol. 6, no. 4, Oct. 2016, pp. 1851-7, https://econjournals.com.tr/index.php/ijefi/article/view/3067.