The capital shares of a limited liability company shall be non-tradable. However, shares may be sold by a written instrument the signatures on which are certified unless otherwise provided for in the company's memorandum of association. Whoever intends to sell his share, or a part of it, shall notify the other partners of the offer he has received and its conditions — in particular the price and the name of the buyer — otherwise the act shall be ineffective. After the lapse of two weeks from the date of notification the partner may sell his share to third parties for the offered price at least if none of the partners requests to buy it. If more than one partner requests to buy the share, it shall be divided among them in proportion to their respective shares in the company's capital. If the assignment of the shares is free of charge, the assigned shares shall not be transferred without the approval of the majority of the partners owning shares of no less than seventy five percent (75%) of the capital after excluding the shares under assignment.