Khapugin, A. A., Chugunov, G. G., & Vargot, E. V. (2017). Cypripedium calceolus is considered as one of the flagship plant species of nature conservation. It is legalCypripedium calceolus (Orchidaceae) in Central Russia: A case study for its populations in two protected areas in the Republic of Mordovia (Russia). Universidad de Costa Rica.

Khapugin, Anatoliy A., Gennadiy G. Chugunov, and Elena V. Vargot. Cypripedium Calceolus Is Considered As One of the Flagship Plant Species of Nature Conservation. It Is LegalCypripedium Calceolus (Orchidaceae) in Central Russia: A Case Study for Its Populations in Two Protected Areas in the Republic of Mordovia (Russia). Universidad de Costa Rica, 2017.

Khapugin, Anatoliy A., Gennadiy G. Chugunov, and Elena V. Vargot. Cypripedium Calceolus Is Considered As One of the Flagship Plant Species of Nature Conservation. It Is LegalCypripedium Calceolus (Orchidaceae) in Central Russia: A Case Study for Its Populations in Two Protected Areas in the Republic of Mordovia (Russia). Universidad de Costa Rica, 2017.