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Firms have an opportunity to establish external links with other firms before competing with them in an oligopolistic market. The analysis of the incentives for the firms to establish these external links and the results of these links show diametrically different results with Cournot or Bertrand type of market competitions.

Today in the Central Africa region, production forests under management cover an area similar to that of protected forests. This is the result of a complex process initiated about 10 years ago, after a long gestation history and a sudden increase in speed in the mid 90s. Managed forests should be considered as an essential complement to the fundamental role of protected areas in their efforts to conserve the rich biodiversity of the region, as well as a significant contributor to economic development. In this paper we present new and updated figures about forest management in Central Africa as well as critical points to be addressed if we want to see progress towards better management and conservation.

The article reviews the opera "Der fliegende änder," directed by Chong Tze Chien and Glen Goei, and starring Oleksandr Pushniak, Kathleen Parker, and Jakub Pustina, performed at the Victoria Theatre in Singapore on October 23, 2016.

The article reviews the Tannhauser opera performed on May 14, 2016 at Innsbruck, Austria produced by Johannes Reitmeier.

The article reviews the opera "Tannhäuser," directed by Florian Lutz and starring Julia Faylenbogen, performed at the Theater Lůbeck on September 7, 2014.

The article reviews a revival of Franz Grillparzer's opera "Der Traum ein Leben," directed by Jürgen R. Weber and starring Manuela Uhl and Mark Morouse, performed at Theater Bonn in Bonn, Germany.

The article reviews the opera "Werther," starring Jose Bros, Antoninette Dennefeld, Milica Ilic, performed at the Auditorio Adan Martin in Santa Cruz de Tenerife, Spain.

The article reviews the opera "Die tote Stadt," directed by Helen Malkowsky and starring Niclas Oettermann, performed in Chemnitz, Germany from October 2014 to April 2015.

The article reviews the opera "Boris Godunov," directed by Plamen Kartaloff, starring Martin Tsonev, Kostadin Andreev and Sergey Drobishevsky, performed at the Alexander Nevsky Cathedral in Sofia, Bulgaria on June 27, 2014.